haftmann@32139
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(* Author: Tobias Nipkow, Lawrence C Paulson and Markus Wenzel; Florian Haftmann, TU Muenchen *)
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clasohm@923
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header {* Complete lattices, with special focus on sets *}
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clasohm@923
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theory Complete_Lattice
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imports Set
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nipkow@15131
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begin
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wenzelm@2261
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notation
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less_eq (infix "\<sqsubseteq>" 50) and
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less (infix "\<sqsubset>" 50) and
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inf (infixl "\<sqinter>" 70) and
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sup (infixl "\<squnion>" 65) and
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top ("\<top>") and
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bot ("\<bottom>")
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subsection {* Syntactic infimum and supremum operations *}
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class Inf =
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fixes Inf :: "'a set \<Rightarrow> 'a" ("\<Sqinter>_" [900] 900)
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class Sup =
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fixes Sup :: "'a set \<Rightarrow> 'a" ("\<Squnion>_" [900] 900)
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subsection {* Abstract complete lattices *}
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class complete_lattice = bounded_lattice + Inf + Sup +
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assumes Inf_lower: "x \<in> A \<Longrightarrow> \<Sqinter>A \<sqsubseteq> x"
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and Inf_greatest: "(\<And>x. x \<in> A \<Longrightarrow> z \<sqsubseteq> x) \<Longrightarrow> z \<sqsubseteq> \<Sqinter>A"
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assumes Sup_upper: "x \<in> A \<Longrightarrow> x \<sqsubseteq> \<Squnion>A"
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and Sup_least: "(\<And>x. x \<in> A \<Longrightarrow> x \<sqsubseteq> z) \<Longrightarrow> \<Squnion>A \<sqsubseteq> z"
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begin
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lemma dual_complete_lattice:
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"class.complete_lattice Sup Inf (op \<ge>) (op >) (op \<squnion>) (op \<sqinter>) \<top> \<bottom>"
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by (auto intro!: class.complete_lattice.intro dual_bounded_lattice)
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(unfold_locales, (fact bot_least top_greatest
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Sup_upper Sup_least Inf_lower Inf_greatest)+)
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lemma Inf_Sup: "\<Sqinter>A = \<Squnion>{b. \<forall>a \<in> A. b \<sqsubseteq> a}"
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by (auto intro: antisym Inf_lower Inf_greatest Sup_upper Sup_least)
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lemma Sup_Inf: "\<Squnion>A = \<Sqinter>{b. \<forall>a \<in> A. a \<sqsubseteq> b}"
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by (auto intro: antisym Inf_lower Inf_greatest Sup_upper Sup_least)
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lemma Inf_empty [simp]:
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"\<Sqinter>{} = \<top>"
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by (auto intro: antisym Inf_greatest)
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lemma Sup_empty [simp]:
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"\<Squnion>{} = \<bottom>"
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by (auto intro: antisym Sup_least)
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lemma Inf_UNIV [simp]:
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"\<Sqinter>UNIV = \<bottom>"
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by (simp add: Sup_Inf Sup_empty [symmetric])
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lemma Sup_UNIV [simp]:
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"\<Squnion>UNIV = \<top>"
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by (simp add: Inf_Sup Inf_empty [symmetric])
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lemma Inf_insert: "\<Sqinter>insert a A = a \<sqinter> \<Sqinter>A"
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by (auto intro: le_infI le_infI1 le_infI2 antisym Inf_greatest Inf_lower)
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lemma Sup_insert: "\<Squnion>insert a A = a \<squnion> \<Squnion>A"
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by (auto intro: le_supI le_supI1 le_supI2 antisym Sup_least Sup_upper)
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lemma Inf_singleton [simp]:
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"\<Sqinter>{a} = a"
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by (auto intro: antisym Inf_lower Inf_greatest)
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lemma Sup_singleton [simp]:
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"\<Squnion>{a} = a"
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by (auto intro: antisym Sup_upper Sup_least)
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lemma Inf_binary:
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"\<Sqinter>{a, b} = a \<sqinter> b"
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by (simp add: Inf_empty Inf_insert)
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lemma Sup_binary:
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"\<Squnion>{a, b} = a \<squnion> b"
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by (simp add: Sup_empty Sup_insert)
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lemma le_Inf_iff: "b \<sqsubseteq> Inf A \<longleftrightarrow> (\<forall>a\<in>A. b \<sqsubseteq> a)"
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by (auto intro: Inf_greatest dest: Inf_lower)
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lemma Sup_le_iff: "Sup A \<sqsubseteq> b \<longleftrightarrow> (\<forall>a\<in>A. a \<sqsubseteq> b)"
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by (auto intro: Sup_least dest: Sup_upper)
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lemma Inf_mono:
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assumes "\<And>b. b \<in> B \<Longrightarrow> \<exists>a\<in>A. a \<sqsubseteq> b"
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shows "Inf A \<sqsubseteq> Inf B"
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proof (rule Inf_greatest)
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fix b assume "b \<in> B"
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with assms obtain a where "a \<in> A" and "a \<sqsubseteq> b" by blast
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from `a \<in> A` have "Inf A \<sqsubseteq> a" by (rule Inf_lower)
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with `a \<sqsubseteq> b` show "Inf A \<sqsubseteq> b" by auto
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qed
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lemma Sup_mono:
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assumes "\<And>a. a \<in> A \<Longrightarrow> \<exists>b\<in>B. a \<sqsubseteq> b"
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shows "Sup A \<sqsubseteq> Sup B"
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proof (rule Sup_least)
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fix a assume "a \<in> A"
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with assms obtain b where "b \<in> B" and "a \<sqsubseteq> b" by blast
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from `b \<in> B` have "b \<sqsubseteq> Sup B" by (rule Sup_upper)
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with `a \<sqsubseteq> b` show "a \<sqsubseteq> Sup B" by auto
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qed
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lemma top_le:
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"top \<sqsubseteq> x \<Longrightarrow> x = top"
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by (rule antisym) auto
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lemma le_bot:
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"x \<sqsubseteq> bot \<Longrightarrow> x = bot"
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by (rule antisym) auto
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lemma not_less_bot[simp]: "\<not> (x \<sqsubset> bot)"
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using bot_least[of x] by (auto simp: le_less)
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lemma not_top_less[simp]: "\<not> (top \<sqsubset> x)"
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using top_greatest[of x] by (auto simp: le_less)
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lemma Sup_upper2: "u \<in> A \<Longrightarrow> v \<sqsubseteq> u \<Longrightarrow> v \<sqsubseteq> Sup A"
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using Sup_upper[of u A] by auto
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lemma Inf_lower2: "u \<in> A \<Longrightarrow> u \<sqsubseteq> v \<Longrightarrow> Inf A \<sqsubseteq> v"
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using Inf_lower[of u A] by auto
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definition INFI :: "'b set \<Rightarrow> ('b \<Rightarrow> 'a) \<Rightarrow> 'a" where
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"INFI A f = \<Sqinter> (f ` A)"
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definition SUPR :: "'b set \<Rightarrow> ('b \<Rightarrow> 'a) \<Rightarrow> 'a" where
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"SUPR A f = \<Squnion> (f ` A)"
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end
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syntax
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"_INF1" :: "pttrns \<Rightarrow> 'b \<Rightarrow> 'b" ("(3INF _./ _)" [0, 10] 10)
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"_INF" :: "pttrn \<Rightarrow> 'a set \<Rightarrow> 'b \<Rightarrow> 'b" ("(3INF _:_./ _)" [0, 0, 10] 10)
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"_SUP1" :: "pttrns \<Rightarrow> 'b \<Rightarrow> 'b" ("(3SUP _./ _)" [0, 10] 10)
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"_SUP" :: "pttrn \<Rightarrow> 'a set \<Rightarrow> 'b \<Rightarrow> 'b" ("(3SUP _:_./ _)" [0, 0, 10] 10)
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syntax (xsymbols)
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"_INF1" :: "pttrns \<Rightarrow> 'b \<Rightarrow> 'b" ("(3\<Sqinter>_./ _)" [0, 10] 10)
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"_INF" :: "pttrn \<Rightarrow> 'a set \<Rightarrow> 'b \<Rightarrow> 'b" ("(3\<Sqinter>_\<in>_./ _)" [0, 0, 10] 10)
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"_SUP1" :: "pttrns \<Rightarrow> 'b \<Rightarrow> 'b" ("(3\<Squnion>_./ _)" [0, 10] 10)
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"_SUP" :: "pttrn \<Rightarrow> 'a set \<Rightarrow> 'b \<Rightarrow> 'b" ("(3\<Squnion>_\<in>_./ _)" [0, 0, 10] 10)
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translations
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"INF x y. B" == "INF x. INF y. B"
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"INF x. B" == "CONST INFI CONST UNIV (%x. B)"
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"INF x. B" == "INF x:CONST UNIV. B"
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"INF x:A. B" == "CONST INFI A (%x. B)"
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"SUP x y. B" == "SUP x. SUP y. B"
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"SUP x. B" == "CONST SUPR CONST UNIV (%x. B)"
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"SUP x. B" == "SUP x:CONST UNIV. B"
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"SUP x:A. B" == "CONST SUPR A (%x. B)"
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print_translation {*
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[Syntax_Trans.preserve_binder_abs2_tr' @{const_syntax INFI} @{syntax_const "_INF"},
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Syntax_Trans.preserve_binder_abs2_tr' @{const_syntax SUPR} @{syntax_const "_SUP"}]
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*} -- {* to avoid eta-contraction of body *}
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context complete_lattice
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begin
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lemma SUP_cong: "(\<And>x. x \<in> A \<Longrightarrow> f x = g x) \<Longrightarrow> SUPR A f = SUPR A g"
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by (simp add: SUPR_def cong: image_cong)
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lemma INF_cong: "(\<And>x. x \<in> A \<Longrightarrow> f x = g x) \<Longrightarrow> INFI A f = INFI A g"
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by (simp add: INFI_def cong: image_cong)
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lemma le_SUPI: "i : A \<Longrightarrow> M i \<sqsubseteq> (SUP i:A. M i)"
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by (auto simp add: SUPR_def intro: Sup_upper)
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lemma le_SUPI2: "i \<in> A \<Longrightarrow> u \<sqsubseteq> M i \<Longrightarrow> u \<sqsubseteq> (SUP i:A. M i)"
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using le_SUPI[of i A M] by auto
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lemma SUP_leI: "(\<And>i. i : A \<Longrightarrow> M i \<sqsubseteq> u) \<Longrightarrow> (SUP i:A. M i) \<sqsubseteq> u"
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by (auto simp add: SUPR_def intro: Sup_least)
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lemma INF_leI: "i : A \<Longrightarrow> (INF i:A. M i) \<sqsubseteq> M i"
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by (auto simp add: INFI_def intro: Inf_lower)
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lemma INF_leI2: "i \<in> A \<Longrightarrow> M i \<sqsubseteq> u \<Longrightarrow> (INF i:A. M i) \<sqsubseteq> u"
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using INF_leI[of i A M] by auto
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lemma le_INFI: "(\<And>i. i : A \<Longrightarrow> u \<sqsubseteq> M i) \<Longrightarrow> u \<sqsubseteq> (INF i:A. M i)"
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by (auto simp add: INFI_def intro: Inf_greatest)
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lemma SUP_le_iff: "(SUP i:A. M i) \<sqsubseteq> u \<longleftrightarrow> (\<forall>i \<in> A. M i \<sqsubseteq> u)"
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unfolding SUPR_def by (auto simp add: Sup_le_iff)
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lemma le_INF_iff: "u \<sqsubseteq> (INF i:A. M i) \<longleftrightarrow> (\<forall>i \<in> A. u \<sqsubseteq> M i)"
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unfolding INFI_def by (auto simp add: le_Inf_iff)
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lemma INF_const[simp]: "A \<noteq> {} \<Longrightarrow> (INF i:A. M) = M"
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by (auto intro: antisym INF_leI le_INFI)
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lemma SUP_const[simp]: "A \<noteq> {} \<Longrightarrow> (SUP i:A. M) = M"
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by (auto intro: antisym SUP_leI le_SUPI)
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lemma INF_mono:
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"(\<And>m. m \<in> B \<Longrightarrow> \<exists>n\<in>A. f n \<le> g m) \<Longrightarrow> (INF n:A. f n) \<le> (INF n:B. g n)"
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by (force intro!: Inf_mono simp: INFI_def)
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lemma SUP_mono:
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"(\<And>n. n \<in> A \<Longrightarrow> \<exists>m\<in>B. f n \<le> g m) \<Longrightarrow> (SUP n:A. f n) \<le> (SUP n:B. g n)"
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by (force intro!: Sup_mono simp: SUPR_def)
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lemma INF_subset: "A \<subseteq> B \<Longrightarrow> INFI B f \<le> INFI A f"
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by (intro INF_mono) auto
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lemma SUP_subset: "A \<subseteq> B \<Longrightarrow> SUPR A f \<le> SUPR B f"
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by (intro SUP_mono) auto
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lemma INF_commute: "(INF i:A. INF j:B. f i j) = (INF j:B. INF i:A. f i j)"
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by (iprover intro: INF_leI le_INFI order_trans antisym)
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lemma SUP_commute: "(SUP i:A. SUP j:B. f i j) = (SUP j:B. SUP i:A. f i j)"
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by (iprover intro: SUP_leI le_SUPI order_trans antisym)
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end
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lemma Inf_less_iff:
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fixes a :: "'a\<Colon>{complete_lattice,linorder}"
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shows "Inf S < a \<longleftrightarrow> (\<exists>x\<in>S. x < a)"
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unfolding not_le[symmetric] le_Inf_iff by auto
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lemma less_Sup_iff:
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fixes a :: "'a\<Colon>{complete_lattice,linorder}"
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shows "a < Sup S \<longleftrightarrow> (\<exists>x\<in>S. a < x)"
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unfolding not_le[symmetric] Sup_le_iff by auto
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lemma INF_less_iff:
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fixes a :: "'a::{complete_lattice,linorder}"
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239 |
shows "(INF i:A. f i) < a \<longleftrightarrow> (\<exists>x\<in>A. f x < a)"
|
haftmann@41330
|
240 |
unfolding INFI_def Inf_less_iff by auto
|
haftmann@32135
|
241 |
|
hoelzl@41114
|
242 |
lemma less_SUP_iff:
|
hoelzl@41114
|
243 |
fixes a :: "'a::{complete_lattice,linorder}"
|
hoelzl@41114
|
244 |
shows "a < (SUP i:A. f i) \<longleftrightarrow> (\<exists>x\<in>A. a < f x)"
|
hoelzl@41114
|
245 |
unfolding SUPR_def less_Sup_iff by auto
|
hoelzl@41114
|
246 |
|
haftmann@32139
|
247 |
subsection {* @{typ bool} and @{typ "_ \<Rightarrow> _"} as complete lattice *}
|
haftmann@32135
|
248 |
|
haftmann@32135
|
249 |
instantiation bool :: complete_lattice
|
haftmann@32135
|
250 |
begin
|
haftmann@32135
|
251 |
|
haftmann@32135
|
252 |
definition
|
haftmann@41328
|
253 |
"\<Sqinter>A \<longleftrightarrow> (\<forall>x\<in>A. x)"
|
haftmann@32135
|
254 |
|
haftmann@32135
|
255 |
definition
|
haftmann@41328
|
256 |
"\<Squnion>A \<longleftrightarrow> (\<exists>x\<in>A. x)"
|
haftmann@32135
|
257 |
|
haftmann@32135
|
258 |
instance proof
|
haftmann@32135
|
259 |
qed (auto simp add: Inf_bool_def Sup_bool_def le_bool_def)
|
haftmann@32135
|
260 |
|
haftmann@32135
|
261 |
end
|
haftmann@32135
|
262 |
|
haftmann@41328
|
263 |
lemma INFI_bool_eq [simp]:
|
haftmann@32135
|
264 |
"INFI = Ball"
|
haftmann@32135
|
265 |
proof (rule ext)+
|
haftmann@32135
|
266 |
fix A :: "'a set"
|
haftmann@32135
|
267 |
fix P :: "'a \<Rightarrow> bool"
|
haftmann@32135
|
268 |
show "(INF x:A. P x) \<longleftrightarrow> (\<forall>x \<in> A. P x)"
|
haftmann@32135
|
269 |
by (auto simp add: Ball_def INFI_def Inf_bool_def)
|
haftmann@32135
|
270 |
qed
|
haftmann@32135
|
271 |
|
haftmann@41328
|
272 |
lemma SUPR_bool_eq [simp]:
|
haftmann@32135
|
273 |
"SUPR = Bex"
|
haftmann@32135
|
274 |
proof (rule ext)+
|
haftmann@32135
|
275 |
fix A :: "'a set"
|
haftmann@32135
|
276 |
fix P :: "'a \<Rightarrow> bool"
|
haftmann@32135
|
277 |
show "(SUP x:A. P x) \<longleftrightarrow> (\<exists>x \<in> A. P x)"
|
haftmann@32135
|
278 |
by (auto simp add: Bex_def SUPR_def Sup_bool_def)
|
haftmann@32135
|
279 |
qed
|
haftmann@32135
|
280 |
|
haftmann@32135
|
281 |
instantiation "fun" :: (type, complete_lattice) complete_lattice
|
haftmann@32135
|
282 |
begin
|
haftmann@32135
|
283 |
|
haftmann@32135
|
284 |
definition
|
haftmann@41328
|
285 |
"\<Sqinter>A = (\<lambda>x. \<Sqinter>{y. \<exists>f\<in>A. y = f x})"
|
haftmann@41328
|
286 |
|
haftmann@41328
|
287 |
lemma Inf_apply:
|
haftmann@41328
|
288 |
"(\<Sqinter>A) x = \<Sqinter>{y. \<exists>f\<in>A. y = f x}"
|
haftmann@41328
|
289 |
by (simp add: Inf_fun_def)
|
haftmann@32135
|
290 |
|
haftmann@32135
|
291 |
definition
|
haftmann@41328
|
292 |
"\<Squnion>A = (\<lambda>x. \<Squnion>{y. \<exists>f\<in>A. y = f x})"
|
haftmann@41328
|
293 |
|
haftmann@41328
|
294 |
lemma Sup_apply:
|
haftmann@41328
|
295 |
"(\<Squnion>A) x = \<Squnion>{y. \<exists>f\<in>A. y = f x}"
|
haftmann@41328
|
296 |
by (simp add: Sup_fun_def)
|
haftmann@32135
|
297 |
|
haftmann@32135
|
298 |
instance proof
|
haftmann@41328
|
299 |
qed (auto simp add: le_fun_def Inf_apply Sup_apply
|
haftmann@32135
|
300 |
intro: Inf_lower Sup_upper Inf_greatest Sup_least)
|
haftmann@32135
|
301 |
|
haftmann@32135
|
302 |
end
|
haftmann@32135
|
303 |
|
haftmann@41328
|
304 |
lemma INFI_apply:
|
haftmann@41328
|
305 |
"(\<Sqinter>y\<in>A. f y) x = (\<Sqinter>y\<in>A. f y x)"
|
haftmann@41328
|
306 |
by (auto intro: arg_cong [of _ _ Inf] simp add: INFI_def Inf_apply)
|
hoelzl@38943
|
307 |
|
haftmann@41328
|
308 |
lemma SUPR_apply:
|
haftmann@41328
|
309 |
"(\<Squnion>y\<in>A. f y) x = (\<Squnion>y\<in>A. f y x)"
|
haftmann@41328
|
310 |
by (auto intro: arg_cong [of _ _ Sup] simp add: SUPR_def Sup_apply)
|
haftmann@32135
|
311 |
|
haftmann@32135
|
312 |
|
haftmann@41330
|
313 |
subsection {* Inter *}
|
haftmann@41330
|
314 |
|
haftmann@41330
|
315 |
abbreviation Inter :: "'a set set \<Rightarrow> 'a set" where
|
haftmann@41330
|
316 |
"Inter S \<equiv> \<Sqinter>S"
|
haftmann@41330
|
317 |
|
haftmann@41330
|
318 |
notation (xsymbols)
|
haftmann@41330
|
319 |
Inter ("\<Inter>_" [90] 90)
|
haftmann@41330
|
320 |
|
haftmann@41330
|
321 |
lemma Inter_eq:
|
haftmann@41330
|
322 |
"\<Inter>A = {x. \<forall>B \<in> A. x \<in> B}"
|
haftmann@41330
|
323 |
proof (rule set_eqI)
|
haftmann@41330
|
324 |
fix x
|
haftmann@41330
|
325 |
have "(\<forall>Q\<in>{P. \<exists>B\<in>A. P \<longleftrightarrow> x \<in> B}. Q) \<longleftrightarrow> (\<forall>B\<in>A. x \<in> B)"
|
haftmann@41330
|
326 |
by auto
|
haftmann@41330
|
327 |
then show "x \<in> \<Inter>A \<longleftrightarrow> x \<in> {x. \<forall>B \<in> A. x \<in> B}"
|
haftmann@41330
|
328 |
by (simp add: Inf_fun_def Inf_bool_def) (simp add: mem_def)
|
haftmann@41330
|
329 |
qed
|
haftmann@41330
|
330 |
|
haftmann@41330
|
331 |
lemma Inter_iff [simp,no_atp]: "(A : Inter C) = (ALL X:C. A:X)"
|
haftmann@41330
|
332 |
by (unfold Inter_eq) blast
|
haftmann@41330
|
333 |
|
haftmann@41330
|
334 |
lemma InterI [intro!]: "(!!X. X:C ==> A:X) ==> A : Inter C"
|
haftmann@41330
|
335 |
by (simp add: Inter_eq)
|
haftmann@41330
|
336 |
|
haftmann@41330
|
337 |
text {*
|
haftmann@41330
|
338 |
\medskip A ``destruct'' rule -- every @{term X} in @{term C}
|
haftmann@41330
|
339 |
contains @{term A} as an element, but @{prop "A:X"} can hold when
|
haftmann@41330
|
340 |
@{prop "X:C"} does not! This rule is analogous to @{text spec}.
|
haftmann@41330
|
341 |
*}
|
haftmann@41330
|
342 |
|
haftmann@41330
|
343 |
lemma InterD [elim, Pure.elim]: "A : Inter C ==> X:C ==> A:X"
|
haftmann@41330
|
344 |
by auto
|
haftmann@41330
|
345 |
|
haftmann@41330
|
346 |
lemma InterE [elim]: "A : Inter C ==> (X~:C ==> R) ==> (A:X ==> R) ==> R"
|
haftmann@41330
|
347 |
-- {* ``Classical'' elimination rule -- does not require proving
|
haftmann@41330
|
348 |
@{prop "X:C"}. *}
|
haftmann@41330
|
349 |
by (unfold Inter_eq) blast
|
haftmann@41330
|
350 |
|
haftmann@41330
|
351 |
lemma Inter_lower: "B \<in> A ==> Inter A \<subseteq> B"
|
haftmann@44593
|
352 |
by (fact Inf_lower)
|
haftmann@44593
|
353 |
|
haftmann@44593
|
354 |
lemma (in complete_lattice) Inf_less_eq:
|
haftmann@44593
|
355 |
assumes "\<And>v. v \<in> A \<Longrightarrow> v \<sqsubseteq> u"
|
haftmann@44593
|
356 |
and "A \<noteq> {}"
|
haftmann@44593
|
357 |
shows "\<Sqinter>A \<le> u"
|
haftmann@44593
|
358 |
proof -
|
haftmann@44593
|
359 |
from `A \<noteq> {}` obtain v where "v \<in> A" by blast
|
haftmann@44593
|
360 |
moreover with assms have "v \<sqsubseteq> u" by blast
|
haftmann@44593
|
361 |
ultimately show ?thesis by (rule Inf_lower2)
|
haftmann@44593
|
362 |
qed
|
haftmann@41330
|
363 |
|
haftmann@41330
|
364 |
lemma Inter_subset:
|
haftmann@41330
|
365 |
"[| !!X. X \<in> A ==> X \<subseteq> B; A ~= {} |] ==> \<Inter>A \<subseteq> B"
|
haftmann@44593
|
366 |
by (fact Inf_less_eq)
|
haftmann@41330
|
367 |
|
haftmann@41330
|
368 |
lemma Inter_greatest: "(!!X. X \<in> A ==> C \<subseteq> X) ==> C \<subseteq> Inter A"
|
haftmann@44593
|
369 |
by (fact Inf_greatest)
|
haftmann@41330
|
370 |
|
haftmann@41330
|
371 |
lemma Int_eq_Inter: "A \<inter> B = \<Inter>{A, B}"
|
haftmann@44592
|
372 |
by (fact Inf_binary [symmetric])
|
haftmann@41330
|
373 |
|
haftmann@41330
|
374 |
lemma Inter_empty [simp]: "\<Inter>{} = UNIV"
|
haftmann@41330
|
375 |
by (fact Inf_empty)
|
haftmann@41330
|
376 |
|
haftmann@41330
|
377 |
lemma Inter_UNIV [simp]: "\<Inter>UNIV = {}"
|
haftmann@44592
|
378 |
by (fact Inf_UNIV)
|
haftmann@41330
|
379 |
|
haftmann@41330
|
380 |
lemma Inter_insert [simp]: "\<Inter>(insert a B) = a \<inter> \<Inter>B"
|
haftmann@44592
|
381 |
by (fact Inf_insert)
|
haftmann@41330
|
382 |
|
haftmann@41330
|
383 |
lemma Inter_Un_subset: "\<Inter>A \<union> \<Inter>B \<subseteq> \<Inter>(A \<inter> B)"
|
haftmann@41330
|
384 |
by blast
|
haftmann@41330
|
385 |
|
haftmann@41330
|
386 |
lemma Inter_Un_distrib: "\<Inter>(A \<union> B) = \<Inter>A \<inter> \<Inter>B"
|
haftmann@41330
|
387 |
by blast
|
haftmann@41330
|
388 |
|
haftmann@41330
|
389 |
lemma Inter_UNIV_conv [simp,no_atp]:
|
haftmann@41330
|
390 |
"(\<Inter>A = UNIV) = (\<forall>x\<in>A. x = UNIV)"
|
haftmann@41330
|
391 |
"(UNIV = \<Inter>A) = (\<forall>x\<in>A. x = UNIV)"
|
haftmann@41330
|
392 |
by blast+
|
haftmann@41330
|
393 |
|
haftmann@41330
|
394 |
lemma Inter_anti_mono: "B \<subseteq> A ==> \<Inter>A \<subseteq> \<Inter>B"
|
haftmann@41330
|
395 |
by blast
|
haftmann@41330
|
396 |
|
haftmann@41330
|
397 |
|
haftmann@41330
|
398 |
subsection {* Intersections of families *}
|
haftmann@41330
|
399 |
|
haftmann@41330
|
400 |
abbreviation INTER :: "'a set \<Rightarrow> ('a \<Rightarrow> 'b set) \<Rightarrow> 'b set" where
|
haftmann@41330
|
401 |
"INTER \<equiv> INFI"
|
haftmann@41330
|
402 |
|
haftmann@41330
|
403 |
syntax
|
haftmann@41330
|
404 |
"_INTER1" :: "pttrns => 'b set => 'b set" ("(3INT _./ _)" [0, 10] 10)
|
haftmann@41330
|
405 |
"_INTER" :: "pttrn => 'a set => 'b set => 'b set" ("(3INT _:_./ _)" [0, 0, 10] 10)
|
haftmann@41330
|
406 |
|
haftmann@41330
|
407 |
syntax (xsymbols)
|
haftmann@41330
|
408 |
"_INTER1" :: "pttrns => 'b set => 'b set" ("(3\<Inter>_./ _)" [0, 10] 10)
|
haftmann@41330
|
409 |
"_INTER" :: "pttrn => 'a set => 'b set => 'b set" ("(3\<Inter>_\<in>_./ _)" [0, 0, 10] 10)
|
haftmann@41330
|
410 |
|
haftmann@41330
|
411 |
syntax (latex output)
|
haftmann@41330
|
412 |
"_INTER1" :: "pttrns => 'b set => 'b set" ("(3\<Inter>(00\<^bsub>_\<^esub>)/ _)" [0, 10] 10)
|
haftmann@41330
|
413 |
"_INTER" :: "pttrn => 'a set => 'b set => 'b set" ("(3\<Inter>(00\<^bsub>_\<in>_\<^esub>)/ _)" [0, 0, 10] 10)
|
haftmann@41330
|
414 |
|
haftmann@41330
|
415 |
translations
|
haftmann@41330
|
416 |
"INT x y. B" == "INT x. INT y. B"
|
haftmann@41330
|
417 |
"INT x. B" == "CONST INTER CONST UNIV (%x. B)"
|
haftmann@41330
|
418 |
"INT x. B" == "INT x:CONST UNIV. B"
|
haftmann@41330
|
419 |
"INT x:A. B" == "CONST INTER A (%x. B)"
|
haftmann@41330
|
420 |
|
haftmann@41330
|
421 |
print_translation {*
|
wenzelm@43156
|
422 |
[Syntax_Trans.preserve_binder_abs2_tr' @{const_syntax INTER} @{syntax_const "_INTER"}]
|
haftmann@41330
|
423 |
*} -- {* to avoid eta-contraction of body *}
|
haftmann@41330
|
424 |
|
haftmann@41330
|
425 |
lemma INTER_eq_Inter_image:
|
haftmann@41330
|
426 |
"(\<Inter>x\<in>A. B x) = \<Inter>(B`A)"
|
haftmann@41330
|
427 |
by (fact INFI_def)
|
haftmann@41330
|
428 |
|
haftmann@41330
|
429 |
lemma Inter_def:
|
haftmann@41330
|
430 |
"\<Inter>S = (\<Inter>x\<in>S. x)"
|
haftmann@41330
|
431 |
by (simp add: INTER_eq_Inter_image image_def)
|
haftmann@41330
|
432 |
|
haftmann@41330
|
433 |
lemma INTER_def:
|
haftmann@41330
|
434 |
"(\<Inter>x\<in>A. B x) = {y. \<forall>x\<in>A. y \<in> B x}"
|
haftmann@41330
|
435 |
by (auto simp add: INTER_eq_Inter_image Inter_eq)
|
haftmann@41330
|
436 |
|
haftmann@41330
|
437 |
lemma Inter_image_eq [simp]:
|
haftmann@41330
|
438 |
"\<Inter>(B`A) = (\<Inter>x\<in>A. B x)"
|
haftmann@41330
|
439 |
by (rule sym) (fact INTER_eq_Inter_image)
|
haftmann@41330
|
440 |
|
haftmann@41330
|
441 |
lemma INT_iff [simp]: "(b: (INT x:A. B x)) = (ALL x:A. b: B x)"
|
haftmann@41330
|
442 |
by (unfold INTER_def) blast
|
haftmann@41330
|
443 |
|
haftmann@41330
|
444 |
lemma INT_I [intro!]: "(!!x. x:A ==> b: B x) ==> b : (INT x:A. B x)"
|
haftmann@41330
|
445 |
by (unfold INTER_def) blast
|
haftmann@41330
|
446 |
|
haftmann@41330
|
447 |
lemma INT_D [elim, Pure.elim]: "b : (INT x:A. B x) ==> a:A ==> b: B a"
|
haftmann@41330
|
448 |
by auto
|
haftmann@41330
|
449 |
|
haftmann@41330
|
450 |
lemma INT_E [elim]: "b : (INT x:A. B x) ==> (b: B a ==> R) ==> (a~:A ==> R) ==> R"
|
haftmann@41330
|
451 |
-- {* "Classical" elimination -- by the Excluded Middle on @{prop "a:A"}. *}
|
haftmann@41330
|
452 |
by (unfold INTER_def) blast
|
haftmann@41330
|
453 |
|
haftmann@41330
|
454 |
lemma INT_cong [cong]:
|
haftmann@41330
|
455 |
"A = B ==> (!!x. x:B ==> C x = D x) ==> (INT x:A. C x) = (INT x:B. D x)"
|
haftmann@41330
|
456 |
by (simp add: INTER_def)
|
haftmann@41330
|
457 |
|
haftmann@41330
|
458 |
lemma Collect_ball_eq: "{x. \<forall>y\<in>A. P x y} = (\<Inter>y\<in>A. {x. P x y})"
|
haftmann@41330
|
459 |
by blast
|
haftmann@41330
|
460 |
|
haftmann@41330
|
461 |
lemma Collect_all_eq: "{x. \<forall>y. P x y} = (\<Inter>y. {x. P x y})"
|
haftmann@41330
|
462 |
by blast
|
haftmann@41330
|
463 |
|
haftmann@41330
|
464 |
lemma INT_lower: "a \<in> A ==> (\<Inter>x\<in>A. B x) \<subseteq> B a"
|
haftmann@41330
|
465 |
by (fact INF_leI)
|
haftmann@41330
|
466 |
|
haftmann@41330
|
467 |
lemma INT_greatest: "(!!x. x \<in> A ==> C \<subseteq> B x) ==> C \<subseteq> (\<Inter>x\<in>A. B x)"
|
haftmann@41330
|
468 |
by (fact le_INFI)
|
haftmann@41330
|
469 |
|
haftmann@41330
|
470 |
lemma INT_empty [simp]: "(\<Inter>x\<in>{}. B x) = UNIV"
|
haftmann@41330
|
471 |
by blast
|
haftmann@41330
|
472 |
|
haftmann@41330
|
473 |
lemma INT_absorb: "k \<in> I ==> A k \<inter> (\<Inter>i\<in>I. A i) = (\<Inter>i\<in>I. A i)"
|
haftmann@41330
|
474 |
by blast
|
haftmann@41330
|
475 |
|
haftmann@41330
|
476 |
lemma INT_subset_iff: "(B \<subseteq> (\<Inter>i\<in>I. A i)) = (\<forall>i\<in>I. B \<subseteq> A i)"
|
haftmann@41330
|
477 |
by (fact le_INF_iff)
|
haftmann@41330
|
478 |
|
haftmann@41330
|
479 |
lemma INT_insert [simp]: "(\<Inter>x \<in> insert a A. B x) = B a \<inter> INTER A B"
|
haftmann@41330
|
480 |
by blast
|
haftmann@41330
|
481 |
|
haftmann@41330
|
482 |
lemma INT_Un: "(\<Inter>i \<in> A \<union> B. M i) = (\<Inter>i \<in> A. M i) \<inter> (\<Inter>i\<in>B. M i)"
|
haftmann@41330
|
483 |
by blast
|
haftmann@41330
|
484 |
|
haftmann@41330
|
485 |
lemma INT_insert_distrib:
|
haftmann@41330
|
486 |
"u \<in> A ==> (\<Inter>x\<in>A. insert a (B x)) = insert a (\<Inter>x\<in>A. B x)"
|
haftmann@41330
|
487 |
by blast
|
haftmann@41330
|
488 |
|
haftmann@41330
|
489 |
lemma INT_constant [simp]: "(\<Inter>y\<in>A. c) = (if A = {} then UNIV else c)"
|
haftmann@41330
|
490 |
by auto
|
haftmann@41330
|
491 |
|
haftmann@41330
|
492 |
lemma INT_eq: "(\<Inter>x\<in>A. B x) = \<Inter>({Y. \<exists>x\<in>A. Y = B x})"
|
haftmann@41330
|
493 |
-- {* Look: it has an \emph{existential} quantifier *}
|
haftmann@41330
|
494 |
by blast
|
haftmann@41330
|
495 |
|
haftmann@41330
|
496 |
lemma INTER_UNIV_conv[simp]:
|
haftmann@41330
|
497 |
"(UNIV = (INT x:A. B x)) = (\<forall>x\<in>A. B x = UNIV)"
|
haftmann@41330
|
498 |
"((INT x:A. B x) = UNIV) = (\<forall>x\<in>A. B x = UNIV)"
|
haftmann@41330
|
499 |
by blast+
|
haftmann@41330
|
500 |
|
haftmann@41330
|
501 |
lemma INT_bool_eq: "(\<Inter>b::bool. A b) = (A True \<inter> A False)"
|
haftmann@41330
|
502 |
by (auto intro: bool_induct)
|
haftmann@41330
|
503 |
|
haftmann@41330
|
504 |
lemma Pow_INT_eq: "Pow (\<Inter>x\<in>A. B x) = (\<Inter>x\<in>A. Pow (B x))"
|
haftmann@41330
|
505 |
by blast
|
haftmann@41330
|
506 |
|
haftmann@41330
|
507 |
lemma INT_anti_mono:
|
haftmann@41330
|
508 |
"B \<subseteq> A ==> (!!x. x \<in> A ==> f x \<subseteq> g x) ==>
|
haftmann@41330
|
509 |
(\<Inter>x\<in>A. f x) \<subseteq> (\<Inter>x\<in>A. g x)"
|
haftmann@41330
|
510 |
-- {* The last inclusion is POSITIVE! *}
|
haftmann@41330
|
511 |
by (blast dest: subsetD)
|
haftmann@41330
|
512 |
|
haftmann@41330
|
513 |
lemma vimage_INT: "f-`(INT x:A. B x) = (INT x:A. f -` B x)"
|
haftmann@41330
|
514 |
by blast
|
haftmann@41330
|
515 |
|
haftmann@41330
|
516 |
|
haftmann@32139
|
517 |
subsection {* Union *}
|
haftmann@32135
|
518 |
|
haftmann@32587
|
519 |
abbreviation Union :: "'a set set \<Rightarrow> 'a set" where
|
haftmann@32587
|
520 |
"Union S \<equiv> \<Squnion>S"
|
haftmann@32135
|
521 |
|
haftmann@32135
|
522 |
notation (xsymbols)
|
haftmann@32135
|
523 |
Union ("\<Union>_" [90] 90)
|
haftmann@32135
|
524 |
|
haftmann@32135
|
525 |
lemma Union_eq:
|
haftmann@32135
|
526 |
"\<Union>A = {x. \<exists>B \<in> A. x \<in> B}"
|
nipkow@39535
|
527 |
proof (rule set_eqI)
|
haftmann@32135
|
528 |
fix x
|
haftmann@32135
|
529 |
have "(\<exists>Q\<in>{P. \<exists>B\<in>A. P \<longleftrightarrow> x \<in> B}. Q) \<longleftrightarrow> (\<exists>B\<in>A. x \<in> B)"
|
haftmann@32135
|
530 |
by auto
|
haftmann@32135
|
531 |
then show "x \<in> \<Union>A \<longleftrightarrow> x \<in> {x. \<exists>B\<in>A. x \<in> B}"
|
haftmann@32587
|
532 |
by (simp add: Sup_fun_def Sup_bool_def) (simp add: mem_def)
|
haftmann@32135
|
533 |
qed
|
haftmann@32135
|
534 |
|
blanchet@35828
|
535 |
lemma Union_iff [simp, no_atp]:
|
haftmann@32135
|
536 |
"A \<in> \<Union>C \<longleftrightarrow> (\<exists>X\<in>C. A\<in>X)"
|
haftmann@32135
|
537 |
by (unfold Union_eq) blast
|
haftmann@32135
|
538 |
|
haftmann@32135
|
539 |
lemma UnionI [intro]:
|
haftmann@32135
|
540 |
"X \<in> C \<Longrightarrow> A \<in> X \<Longrightarrow> A \<in> \<Union>C"
|
haftmann@32135
|
541 |
-- {* The order of the premises presupposes that @{term C} is rigid;
|
haftmann@32135
|
542 |
@{term A} may be flexible. *}
|
haftmann@32135
|
543 |
by auto
|
haftmann@32135
|
544 |
|
haftmann@32135
|
545 |
lemma UnionE [elim!]:
|
haftmann@32135
|
546 |
"A \<in> \<Union>C \<Longrightarrow> (\<And>X. A\<in>X \<Longrightarrow> X\<in>C \<Longrightarrow> R) \<Longrightarrow> R"
|
haftmann@32135
|
547 |
by auto
|
haftmann@32135
|
548 |
|
haftmann@32135
|
549 |
lemma Union_upper: "B \<in> A ==> B \<subseteq> Union A"
|
haftmann@32135
|
550 |
by (iprover intro: subsetI UnionI)
|
haftmann@32135
|
551 |
|
haftmann@32135
|
552 |
lemma Union_least: "(!!X. X \<in> A ==> X \<subseteq> C) ==> Union A \<subseteq> C"
|
haftmann@32135
|
553 |
by (iprover intro: subsetI elim: UnionE dest: subsetD)
|
haftmann@32135
|
554 |
|
haftmann@32135
|
555 |
lemma Un_eq_Union: "A \<union> B = \<Union>{A, B}"
|
haftmann@32135
|
556 |
by blast
|
haftmann@32135
|
557 |
|
haftmann@32135
|
558 |
lemma Union_empty [simp]: "Union({}) = {}"
|
haftmann@32135
|
559 |
by blast
|
haftmann@32135
|
560 |
|
haftmann@32135
|
561 |
lemma Union_UNIV [simp]: "Union UNIV = UNIV"
|
haftmann@32135
|
562 |
by blast
|
haftmann@32135
|
563 |
|
haftmann@32135
|
564 |
lemma Union_insert [simp]: "Union (insert a B) = a \<union> \<Union>B"
|
haftmann@32135
|
565 |
by blast
|
haftmann@32135
|
566 |
|
haftmann@32135
|
567 |
lemma Union_Un_distrib [simp]: "\<Union>(A Un B) = \<Union>A \<union> \<Union>B"
|
haftmann@32135
|
568 |
by blast
|
haftmann@32135
|
569 |
|
haftmann@32135
|
570 |
lemma Union_Int_subset: "\<Union>(A \<inter> B) \<subseteq> \<Union>A \<inter> \<Union>B"
|
haftmann@32135
|
571 |
by blast
|
haftmann@32135
|
572 |
|
blanchet@35828
|
573 |
lemma Union_empty_conv [simp,no_atp]: "(\<Union>A = {}) = (\<forall>x\<in>A. x = {})"
|
haftmann@32135
|
574 |
by blast
|
haftmann@32135
|
575 |
|
blanchet@35828
|
576 |
lemma empty_Union_conv [simp,no_atp]: "({} = \<Union>A) = (\<forall>x\<in>A. x = {})"
|
haftmann@32135
|
577 |
by blast
|
haftmann@32135
|
578 |
|
haftmann@32135
|
579 |
lemma Union_disjoint: "(\<Union>C \<inter> A = {}) = (\<forall>B\<in>C. B \<inter> A = {})"
|
haftmann@32135
|
580 |
by blast
|
haftmann@32135
|
581 |
|
haftmann@32135
|
582 |
lemma subset_Pow_Union: "A \<subseteq> Pow (\<Union>A)"
|
haftmann@32135
|
583 |
by blast
|
haftmann@32135
|
584 |
|
haftmann@32135
|
585 |
lemma Union_Pow_eq [simp]: "\<Union>(Pow A) = A"
|
haftmann@32135
|
586 |
by blast
|
haftmann@32135
|
587 |
|
haftmann@32135
|
588 |
lemma Union_mono: "A \<subseteq> B ==> \<Union>A \<subseteq> \<Union>B"
|
haftmann@32135
|
589 |
by blast
|
haftmann@32135
|
590 |
|
haftmann@32135
|
591 |
|
haftmann@32139
|
592 |
subsection {* Unions of families *}
|
haftmann@32135
|
593 |
|
haftmann@32606
|
594 |
abbreviation UNION :: "'a set \<Rightarrow> ('a \<Rightarrow> 'b set) \<Rightarrow> 'b set" where
|
haftmann@32606
|
595 |
"UNION \<equiv> SUPR"
|
haftmann@32135
|
596 |
|
haftmann@32135
|
597 |
syntax
|
wenzelm@35118
|
598 |
"_UNION1" :: "pttrns => 'b set => 'b set" ("(3UN _./ _)" [0, 10] 10)
|
huffman@36360
|
599 |
"_UNION" :: "pttrn => 'a set => 'b set => 'b set" ("(3UN _:_./ _)" [0, 0, 10] 10)
|
haftmann@32135
|
600 |
|
haftmann@32135
|
601 |
syntax (xsymbols)
|
wenzelm@35118
|
602 |
"_UNION1" :: "pttrns => 'b set => 'b set" ("(3\<Union>_./ _)" [0, 10] 10)
|
huffman@36360
|
603 |
"_UNION" :: "pttrn => 'a set => 'b set => 'b set" ("(3\<Union>_\<in>_./ _)" [0, 0, 10] 10)
|
haftmann@32135
|
604 |
|
haftmann@32135
|
605 |
syntax (latex output)
|
wenzelm@35118
|
606 |
"_UNION1" :: "pttrns => 'b set => 'b set" ("(3\<Union>(00\<^bsub>_\<^esub>)/ _)" [0, 10] 10)
|
huffman@36360
|
607 |
"_UNION" :: "pttrn => 'a set => 'b set => 'b set" ("(3\<Union>(00\<^bsub>_\<in>_\<^esub>)/ _)" [0, 0, 10] 10)
|
haftmann@32135
|
608 |
|
haftmann@32135
|
609 |
translations
|
haftmann@32135
|
610 |
"UN x y. B" == "UN x. UN y. B"
|
haftmann@32135
|
611 |
"UN x. B" == "CONST UNION CONST UNIV (%x. B)"
|
haftmann@32135
|
612 |
"UN x. B" == "UN x:CONST UNIV. B"
|
haftmann@32135
|
613 |
"UN x:A. B" == "CONST UNION A (%x. B)"
|
haftmann@32135
|
614 |
|
haftmann@32135
|
615 |
text {*
|
haftmann@32135
|
616 |
Note the difference between ordinary xsymbol syntax of indexed
|
haftmann@32135
|
617 |
unions and intersections (e.g.\ @{text"\<Union>a\<^isub>1\<in>A\<^isub>1. B"})
|
haftmann@32135
|
618 |
and their \LaTeX\ rendition: @{term"\<Union>a\<^isub>1\<in>A\<^isub>1. B"}. The
|
haftmann@32135
|
619 |
former does not make the index expression a subscript of the
|
haftmann@32135
|
620 |
union/intersection symbol because this leads to problems with nested
|
haftmann@32135
|
621 |
subscripts in Proof General.
|
haftmann@32135
|
622 |
*}
|
haftmann@32135
|
623 |
|
wenzelm@35118
|
624 |
print_translation {*
|
wenzelm@43156
|
625 |
[Syntax_Trans.preserve_binder_abs2_tr' @{const_syntax UNION} @{syntax_const "_UNION"}]
|
wenzelm@35118
|
626 |
*} -- {* to avoid eta-contraction of body *}
|
haftmann@32135
|
627 |
|
haftmann@32135
|
628 |
lemma UNION_eq_Union_image:
|
haftmann@32135
|
629 |
"(\<Union>x\<in>A. B x) = \<Union>(B`A)"
|
haftmann@32606
|
630 |
by (fact SUPR_def)
|
haftmann@32135
|
631 |
|
haftmann@32135
|
632 |
lemma Union_def:
|
haftmann@32135
|
633 |
"\<Union>S = (\<Union>x\<in>S. x)"
|
haftmann@32135
|
634 |
by (simp add: UNION_eq_Union_image image_def)
|
haftmann@32135
|
635 |
|
blanchet@35828
|
636 |
lemma UNION_def [no_atp]:
|
haftmann@32135
|
637 |
"(\<Union>x\<in>A. B x) = {y. \<exists>x\<in>A. y \<in> B x}"
|
haftmann@32135
|
638 |
by (auto simp add: UNION_eq_Union_image Union_eq)
|
haftmann@32135
|
639 |
|
haftmann@32135
|
640 |
lemma Union_image_eq [simp]:
|
haftmann@32135
|
641 |
"\<Union>(B`A) = (\<Union>x\<in>A. B x)"
|
haftmann@32135
|
642 |
by (rule sym) (fact UNION_eq_Union_image)
|
haftmann@32135
|
643 |
|
haftmann@32135
|
644 |
lemma UN_iff [simp]: "(b: (UN x:A. B x)) = (EX x:A. b: B x)"
|
haftmann@32135
|
645 |
by (unfold UNION_def) blast
|
haftmann@32135
|
646 |
|
haftmann@32135
|
647 |
lemma UN_I [intro]: "a:A ==> b: B a ==> b: (UN x:A. B x)"
|
haftmann@32135
|
648 |
-- {* The order of the premises presupposes that @{term A} is rigid;
|
haftmann@32135
|
649 |
@{term b} may be flexible. *}
|
haftmann@32135
|
650 |
by auto
|
haftmann@32135
|
651 |
|
haftmann@32135
|
652 |
lemma UN_E [elim!]: "b : (UN x:A. B x) ==> (!!x. x:A ==> b: B x ==> R) ==> R"
|
haftmann@32135
|
653 |
by (unfold UNION_def) blast
|
haftmann@32135
|
654 |
|
haftmann@32135
|
655 |
lemma UN_cong [cong]:
|
haftmann@32135
|
656 |
"A = B ==> (!!x. x:B ==> C x = D x) ==> (UN x:A. C x) = (UN x:B. D x)"
|
haftmann@32135
|
657 |
by (simp add: UNION_def)
|
haftmann@32135
|
658 |
|
haftmann@32135
|
659 |
lemma strong_UN_cong:
|
haftmann@32135
|
660 |
"A = B ==> (!!x. x:B =simp=> C x = D x) ==> (UN x:A. C x) = (UN x:B. D x)"
|
haftmann@32135
|
661 |
by (simp add: UNION_def simp_implies_def)
|
haftmann@32135
|
662 |
|
haftmann@32135
|
663 |
lemma image_eq_UN: "f`A = (UN x:A. {f x})"
|
haftmann@32135
|
664 |
by blast
|
haftmann@32135
|
665 |
|
haftmann@32135
|
666 |
lemma UN_upper: "a \<in> A ==> B a \<subseteq> (\<Union>x\<in>A. B x)"
|
haftmann@32606
|
667 |
by (fact le_SUPI)
|
haftmann@32135
|
668 |
|
haftmann@32135
|
669 |
lemma UN_least: "(!!x. x \<in> A ==> B x \<subseteq> C) ==> (\<Union>x\<in>A. B x) \<subseteq> C"
|
haftmann@32135
|
670 |
by (iprover intro: subsetI elim: UN_E dest: subsetD)
|
haftmann@32135
|
671 |
|
blanchet@35828
|
672 |
lemma Collect_bex_eq [no_atp]: "{x. \<exists>y\<in>A. P x y} = (\<Union>y\<in>A. {x. P x y})"
|
haftmann@32135
|
673 |
by blast
|
haftmann@32135
|
674 |
|
haftmann@32135
|
675 |
lemma UN_insert_distrib: "u \<in> A ==> (\<Union>x\<in>A. insert a (B x)) = insert a (\<Union>x\<in>A. B x)"
|
haftmann@32135
|
676 |
by blast
|
haftmann@32135
|
677 |
|
blanchet@35828
|
678 |
lemma UN_empty [simp,no_atp]: "(\<Union>x\<in>{}. B x) = {}"
|
haftmann@32135
|
679 |
by blast
|
haftmann@32135
|
680 |
|
haftmann@32135
|
681 |
lemma UN_empty2 [simp]: "(\<Union>x\<in>A. {}) = {}"
|
haftmann@32135
|
682 |
by blast
|
haftmann@32135
|
683 |
|
haftmann@32135
|
684 |
lemma UN_singleton [simp]: "(\<Union>x\<in>A. {x}) = A"
|
haftmann@32135
|
685 |
by blast
|
haftmann@32135
|
686 |
|
haftmann@32135
|
687 |
lemma UN_absorb: "k \<in> I ==> A k \<union> (\<Union>i\<in>I. A i) = (\<Union>i\<in>I. A i)"
|
haftmann@32135
|
688 |
by auto
|
haftmann@32135
|
689 |
|
haftmann@32135
|
690 |
lemma UN_insert [simp]: "(\<Union>x\<in>insert a A. B x) = B a \<union> UNION A B"
|
haftmann@32135
|
691 |
by blast
|
haftmann@32135
|
692 |
|
haftmann@32135
|
693 |
lemma UN_Un[simp]: "(\<Union>i \<in> A \<union> B. M i) = (\<Union>i\<in>A. M i) \<union> (\<Union>i\<in>B. M i)"
|
haftmann@32135
|
694 |
by blast
|
haftmann@32135
|
695 |
|
haftmann@32135
|
696 |
lemma UN_UN_flatten: "(\<Union>x \<in> (\<Union>y\<in>A. B y). C x) = (\<Union>y\<in>A. \<Union>x\<in>B y. C x)"
|
haftmann@32135
|
697 |
by blast
|
haftmann@32135
|
698 |
|
haftmann@32135
|
699 |
lemma UN_subset_iff: "((\<Union>i\<in>I. A i) \<subseteq> B) = (\<forall>i\<in>I. A i \<subseteq> B)"
|
huffman@35629
|
700 |
by (fact SUP_le_iff)
|
haftmann@32135
|
701 |
|
haftmann@32135
|
702 |
lemma image_Union: "f ` \<Union>S = (\<Union>x\<in>S. f ` x)"
|
haftmann@32135
|
703 |
by blast
|
haftmann@32135
|
704 |
|
haftmann@32135
|
705 |
lemma UN_constant [simp]: "(\<Union>y\<in>A. c) = (if A = {} then {} else c)"
|
haftmann@32135
|
706 |
by auto
|
haftmann@32135
|
707 |
|
haftmann@32135
|
708 |
lemma UN_eq: "(\<Union>x\<in>A. B x) = \<Union>({Y. \<exists>x\<in>A. Y = B x})"
|
haftmann@32135
|
709 |
by blast
|
haftmann@32135
|
710 |
|
haftmann@32135
|
711 |
lemma UNION_empty_conv[simp]:
|
haftmann@32135
|
712 |
"({} = (UN x:A. B x)) = (\<forall>x\<in>A. B x = {})"
|
haftmann@32135
|
713 |
"((UN x:A. B x) = {}) = (\<forall>x\<in>A. B x = {})"
|
haftmann@32135
|
714 |
by blast+
|
haftmann@32135
|
715 |
|
blanchet@35828
|
716 |
lemma Collect_ex_eq [no_atp]: "{x. \<exists>y. P x y} = (\<Union>y. {x. P x y})"
|
haftmann@32135
|
717 |
by blast
|
haftmann@32135
|
718 |
|
haftmann@32135
|
719 |
lemma ball_UN: "(\<forall>z \<in> UNION A B. P z) = (\<forall>x\<in>A. \<forall>z \<in> B x. P z)"
|
haftmann@32135
|
720 |
by blast
|
haftmann@32135
|
721 |
|
haftmann@32135
|
722 |
lemma bex_UN: "(\<exists>z \<in> UNION A B. P z) = (\<exists>x\<in>A. \<exists>z\<in>B x. P z)"
|
haftmann@32135
|
723 |
by blast
|
haftmann@32135
|
724 |
|
haftmann@32135
|
725 |
lemma Un_eq_UN: "A \<union> B = (\<Union>b. if b then A else B)"
|
haftmann@32135
|
726 |
by (auto simp add: split_if_mem2)
|
haftmann@32135
|
727 |
|
haftmann@32135
|
728 |
lemma UN_bool_eq: "(\<Union>b::bool. A b) = (A True \<union> A False)"
|
haftmann@32135
|
729 |
by (auto intro: bool_contrapos)
|
haftmann@32135
|
730 |
|
haftmann@32135
|
731 |
lemma UN_Pow_subset: "(\<Union>x\<in>A. Pow (B x)) \<subseteq> Pow (\<Union>x\<in>A. B x)"
|
haftmann@32135
|
732 |
by blast
|
haftmann@32135
|
733 |
|
haftmann@32135
|
734 |
lemma UN_mono:
|
haftmann@32135
|
735 |
"A \<subseteq> B ==> (!!x. x \<in> A ==> f x \<subseteq> g x) ==>
|
haftmann@32135
|
736 |
(\<Union>x\<in>A. f x) \<subseteq> (\<Union>x\<in>B. g x)"
|
haftmann@32135
|
737 |
by (blast dest: subsetD)
|
haftmann@32135
|
738 |
|
haftmann@32135
|
739 |
lemma vimage_Union: "f -` (Union A) = (UN X:A. f -` X)"
|
haftmann@32135
|
740 |
by blast
|
haftmann@32135
|
741 |
|
haftmann@32135
|
742 |
lemma vimage_UN: "f-`(UN x:A. B x) = (UN x:A. f -` B x)"
|
haftmann@32135
|
743 |
by blast
|
haftmann@32135
|
744 |
|
haftmann@32135
|
745 |
lemma vimage_eq_UN: "f-`B = (UN y: B. f-`{y})"
|
haftmann@32135
|
746 |
-- {* NOT suitable for rewriting *}
|
haftmann@32135
|
747 |
by blast
|
haftmann@32135
|
748 |
|
haftmann@32135
|
749 |
lemma image_UN: "(f ` (UNION A B)) = (UN x:A.(f ` (B x)))"
|
haftmann@32135
|
750 |
by blast
|
haftmann@32135
|
751 |
|
haftmann@32135
|
752 |
|
haftmann@32139
|
753 |
subsection {* Distributive laws *}
|
haftmann@32135
|
754 |
|
haftmann@32135
|
755 |
lemma Int_Union: "A \<inter> \<Union>B = (\<Union>C\<in>B. A \<inter> C)"
|
haftmann@32135
|
756 |
by blast
|
haftmann@32135
|
757 |
|
haftmann@32135
|
758 |
lemma Int_Union2: "\<Union>B \<inter> A = (\<Union>C\<in>B. C \<inter> A)"
|
haftmann@32135
|
759 |
by blast
|
haftmann@32135
|
760 |
|
haftmann@32135
|
761 |
lemma Un_Union_image: "(\<Union>x\<in>C. A x \<union> B x) = \<Union>(A`C) \<union> \<Union>(B`C)"
|
haftmann@32135
|
762 |
-- {* Devlin, Fundamentals of Contemporary Set Theory, page 12, exercise 5: *}
|
haftmann@32135
|
763 |
-- {* Union of a family of unions *}
|
haftmann@32135
|
764 |
by blast
|
haftmann@32135
|
765 |
|
haftmann@32135
|
766 |
lemma UN_Un_distrib: "(\<Union>i\<in>I. A i \<union> B i) = (\<Union>i\<in>I. A i) \<union> (\<Union>i\<in>I. B i)"
|
haftmann@32135
|
767 |
-- {* Equivalent version *}
|
haftmann@32135
|
768 |
by blast
|
haftmann@32135
|
769 |
|
haftmann@32135
|
770 |
lemma Un_Inter: "A \<union> \<Inter>B = (\<Inter>C\<in>B. A \<union> C)"
|
haftmann@32135
|
771 |
by blast
|
haftmann@32135
|
772 |
|
haftmann@32135
|
773 |
lemma Int_Inter_image: "(\<Inter>x\<in>C. A x \<inter> B x) = \<Inter>(A`C) \<inter> \<Inter>(B`C)"
|
haftmann@32135
|
774 |
by blast
|
haftmann@32135
|
775 |
|
haftmann@32135
|
776 |
lemma INT_Int_distrib: "(\<Inter>i\<in>I. A i \<inter> B i) = (\<Inter>i\<in>I. A i) \<inter> (\<Inter>i\<in>I. B i)"
|
haftmann@32135
|
777 |
-- {* Equivalent version *}
|
haftmann@32135
|
778 |
by blast
|
haftmann@32135
|
779 |
|
haftmann@32135
|
780 |
lemma Int_UN_distrib: "B \<inter> (\<Union>i\<in>I. A i) = (\<Union>i\<in>I. B \<inter> A i)"
|
haftmann@32135
|
781 |
-- {* Halmos, Naive Set Theory, page 35. *}
|
haftmann@32135
|
782 |
by blast
|
haftmann@32135
|
783 |
|
haftmann@32135
|
784 |
lemma Un_INT_distrib: "B \<union> (\<Inter>i\<in>I. A i) = (\<Inter>i\<in>I. B \<union> A i)"
|
haftmann@32135
|
785 |
by blast
|
haftmann@32135
|
786 |
|
haftmann@32135
|
787 |
lemma Int_UN_distrib2: "(\<Union>i\<in>I. A i) \<inter> (\<Union>j\<in>J. B j) = (\<Union>i\<in>I. \<Union>j\<in>J. A i \<inter> B j)"
|
haftmann@32135
|
788 |
by blast
|
haftmann@32135
|
789 |
|
haftmann@32135
|
790 |
lemma Un_INT_distrib2: "(\<Inter>i\<in>I. A i) \<union> (\<Inter>j\<in>J. B j) = (\<Inter>i\<in>I. \<Inter>j\<in>J. A i \<union> B j)"
|
haftmann@32135
|
791 |
by blast
|
haftmann@32135
|
792 |
|
haftmann@32135
|
793 |
|
haftmann@32139
|
794 |
subsection {* Complement *}
|
haftmann@32135
|
795 |
|
haftmann@32135
|
796 |
lemma Compl_UN [simp]: "-(\<Union>x\<in>A. B x) = (\<Inter>x\<in>A. -B x)"
|
haftmann@32135
|
797 |
by blast
|
haftmann@32135
|
798 |
|
haftmann@32135
|
799 |
lemma Compl_INT [simp]: "-(\<Inter>x\<in>A. B x) = (\<Union>x\<in>A. -B x)"
|
haftmann@32135
|
800 |
by blast
|
haftmann@32135
|
801 |
|
haftmann@32135
|
802 |
|
haftmann@32139
|
803 |
subsection {* Miniscoping and maxiscoping *}
|
haftmann@32135
|
804 |
|
haftmann@32135
|
805 |
text {* \medskip Miniscoping: pushing in quantifiers and big Unions
|
haftmann@32135
|
806 |
and Intersections. *}
|
haftmann@32135
|
807 |
|
haftmann@32135
|
808 |
lemma UN_simps [simp]:
|
haftmann@32135
|
809 |
"!!a B C. (UN x:C. insert a (B x)) = (if C={} then {} else insert a (UN x:C. B x))"
|
haftmann@32135
|
810 |
"!!A B C. (UN x:C. A x Un B) = ((if C={} then {} else (UN x:C. A x) Un B))"
|
haftmann@32135
|
811 |
"!!A B C. (UN x:C. A Un B x) = ((if C={} then {} else A Un (UN x:C. B x)))"
|
haftmann@32135
|
812 |
"!!A B C. (UN x:C. A x Int B) = ((UN x:C. A x) Int B)"
|
haftmann@32135
|
813 |
"!!A B C. (UN x:C. A Int B x) = (A Int (UN x:C. B x))"
|
haftmann@32135
|
814 |
"!!A B C. (UN x:C. A x - B) = ((UN x:C. A x) - B)"
|
haftmann@32135
|
815 |
"!!A B C. (UN x:C. A - B x) = (A - (INT x:C. B x))"
|
haftmann@32135
|
816 |
"!!A B. (UN x: Union A. B x) = (UN y:A. UN x:y. B x)"
|
haftmann@32135
|
817 |
"!!A B C. (UN z: UNION A B. C z) = (UN x:A. UN z: B(x). C z)"
|
haftmann@32135
|
818 |
"!!A B f. (UN x:f`A. B x) = (UN a:A. B (f a))"
|
haftmann@32135
|
819 |
by auto
|
haftmann@32135
|
820 |
|
haftmann@32135
|
821 |
lemma INT_simps [simp]:
|
haftmann@32135
|
822 |
"!!A B C. (INT x:C. A x Int B) = (if C={} then UNIV else (INT x:C. A x) Int B)"
|
haftmann@32135
|
823 |
"!!A B C. (INT x:C. A Int B x) = (if C={} then UNIV else A Int (INT x:C. B x))"
|
haftmann@32135
|
824 |
"!!A B C. (INT x:C. A x - B) = (if C={} then UNIV else (INT x:C. A x) - B)"
|
haftmann@32135
|
825 |
"!!A B C. (INT x:C. A - B x) = (if C={} then UNIV else A - (UN x:C. B x))"
|
haftmann@32135
|
826 |
"!!a B C. (INT x:C. insert a (B x)) = insert a (INT x:C. B x)"
|
haftmann@32135
|
827 |
"!!A B C. (INT x:C. A x Un B) = ((INT x:C. A x) Un B)"
|
haftmann@32135
|
828 |
"!!A B C. (INT x:C. A Un B x) = (A Un (INT x:C. B x))"
|
haftmann@32135
|
829 |
"!!A B. (INT x: Union A. B x) = (INT y:A. INT x:y. B x)"
|
haftmann@32135
|
830 |
"!!A B C. (INT z: UNION A B. C z) = (INT x:A. INT z: B(x). C z)"
|
haftmann@32135
|
831 |
"!!A B f. (INT x:f`A. B x) = (INT a:A. B (f a))"
|
haftmann@32135
|
832 |
by auto
|
haftmann@32135
|
833 |
|
blanchet@35828
|
834 |
lemma ball_simps [simp,no_atp]:
|
haftmann@32135
|
835 |
"!!A P Q. (ALL x:A. P x | Q) = ((ALL x:A. P x) | Q)"
|
haftmann@32135
|
836 |
"!!A P Q. (ALL x:A. P | Q x) = (P | (ALL x:A. Q x))"
|
haftmann@32135
|
837 |
"!!A P Q. (ALL x:A. P --> Q x) = (P --> (ALL x:A. Q x))"
|
haftmann@32135
|
838 |
"!!A P Q. (ALL x:A. P x --> Q) = ((EX x:A. P x) --> Q)"
|
haftmann@32135
|
839 |
"!!P. (ALL x:{}. P x) = True"
|
haftmann@32135
|
840 |
"!!P. (ALL x:UNIV. P x) = (ALL x. P x)"
|
haftmann@32135
|
841 |
"!!a B P. (ALL x:insert a B. P x) = (P a & (ALL x:B. P x))"
|
haftmann@32135
|
842 |
"!!A P. (ALL x:Union A. P x) = (ALL y:A. ALL x:y. P x)"
|
haftmann@32135
|
843 |
"!!A B P. (ALL x: UNION A B. P x) = (ALL a:A. ALL x: B a. P x)"
|
haftmann@32135
|
844 |
"!!P Q. (ALL x:Collect Q. P x) = (ALL x. Q x --> P x)"
|
haftmann@32135
|
845 |
"!!A P f. (ALL x:f`A. P x) = (ALL x:A. P (f x))"
|
haftmann@32135
|
846 |
"!!A P. (~(ALL x:A. P x)) = (EX x:A. ~P x)"
|
haftmann@32135
|
847 |
by auto
|
haftmann@32135
|
848 |
|
blanchet@35828
|
849 |
lemma bex_simps [simp,no_atp]:
|
haftmann@32135
|
850 |
"!!A P Q. (EX x:A. P x & Q) = ((EX x:A. P x) & Q)"
|
haftmann@32135
|
851 |
"!!A P Q. (EX x:A. P & Q x) = (P & (EX x:A. Q x))"
|
haftmann@32135
|
852 |
"!!P. (EX x:{}. P x) = False"
|
haftmann@32135
|
853 |
"!!P. (EX x:UNIV. P x) = (EX x. P x)"
|
haftmann@32135
|
854 |
"!!a B P. (EX x:insert a B. P x) = (P(a) | (EX x:B. P x))"
|
haftmann@32135
|
855 |
"!!A P. (EX x:Union A. P x) = (EX y:A. EX x:y. P x)"
|
haftmann@32135
|
856 |
"!!A B P. (EX x: UNION A B. P x) = (EX a:A. EX x:B a. P x)"
|
haftmann@32135
|
857 |
"!!P Q. (EX x:Collect Q. P x) = (EX x. Q x & P x)"
|
haftmann@32135
|
858 |
"!!A P f. (EX x:f`A. P x) = (EX x:A. P (f x))"
|
haftmann@32135
|
859 |
"!!A P. (~(EX x:A. P x)) = (ALL x:A. ~P x)"
|
haftmann@32135
|
860 |
by auto
|
haftmann@32135
|
861 |
|
haftmann@32135
|
862 |
lemma ball_conj_distrib:
|
haftmann@32135
|
863 |
"(ALL x:A. P x & Q x) = ((ALL x:A. P x) & (ALL x:A. Q x))"
|
haftmann@32135
|
864 |
by blast
|
haftmann@32135
|
865 |
|
haftmann@32135
|
866 |
lemma bex_disj_distrib:
|
haftmann@32135
|
867 |
"(EX x:A. P x | Q x) = ((EX x:A. P x) | (EX x:A. Q x))"
|
haftmann@32135
|
868 |
by blast
|
haftmann@32135
|
869 |
|
haftmann@32135
|
870 |
|
haftmann@32135
|
871 |
text {* \medskip Maxiscoping: pulling out big Unions and Intersections. *}
|
haftmann@32135
|
872 |
|
haftmann@32135
|
873 |
lemma UN_extend_simps:
|
haftmann@32135
|
874 |
"!!a B C. insert a (UN x:C. B x) = (if C={} then {a} else (UN x:C. insert a (B x)))"
|
haftmann@32135
|
875 |
"!!A B C. (UN x:C. A x) Un B = (if C={} then B else (UN x:C. A x Un B))"
|
haftmann@32135
|
876 |
"!!A B C. A Un (UN x:C. B x) = (if C={} then A else (UN x:C. A Un B x))"
|
haftmann@32135
|
877 |
"!!A B C. ((UN x:C. A x) Int B) = (UN x:C. A x Int B)"
|
haftmann@32135
|
878 |
"!!A B C. (A Int (UN x:C. B x)) = (UN x:C. A Int B x)"
|
haftmann@32135
|
879 |
"!!A B C. ((UN x:C. A x) - B) = (UN x:C. A x - B)"
|
haftmann@32135
|
880 |
"!!A B C. (A - (INT x:C. B x)) = (UN x:C. A - B x)"
|
haftmann@32135
|
881 |
"!!A B. (UN y:A. UN x:y. B x) = (UN x: Union A. B x)"
|
haftmann@32135
|
882 |
"!!A B C. (UN x:A. UN z: B(x). C z) = (UN z: UNION A B. C z)"
|
haftmann@32135
|
883 |
"!!A B f. (UN a:A. B (f a)) = (UN x:f`A. B x)"
|
haftmann@32135
|
884 |
by auto
|
haftmann@32135
|
885 |
|
haftmann@32135
|
886 |
lemma INT_extend_simps:
|
haftmann@32135
|
887 |
"!!A B C. (INT x:C. A x) Int B = (if C={} then B else (INT x:C. A x Int B))"
|
haftmann@32135
|
888 |
"!!A B C. A Int (INT x:C. B x) = (if C={} then A else (INT x:C. A Int B x))"
|
haftmann@32135
|
889 |
"!!A B C. (INT x:C. A x) - B = (if C={} then UNIV-B else (INT x:C. A x - B))"
|
haftmann@32135
|
890 |
"!!A B C. A - (UN x:C. B x) = (if C={} then A else (INT x:C. A - B x))"
|
haftmann@32135
|
891 |
"!!a B C. insert a (INT x:C. B x) = (INT x:C. insert a (B x))"
|
haftmann@32135
|
892 |
"!!A B C. ((INT x:C. A x) Un B) = (INT x:C. A x Un B)"
|
haftmann@32135
|
893 |
"!!A B C. A Un (INT x:C. B x) = (INT x:C. A Un B x)"
|
haftmann@32135
|
894 |
"!!A B. (INT y:A. INT x:y. B x) = (INT x: Union A. B x)"
|
haftmann@32135
|
895 |
"!!A B C. (INT x:A. INT z: B(x). C z) = (INT z: UNION A B. C z)"
|
haftmann@32135
|
896 |
"!!A B f. (INT a:A. B (f a)) = (INT x:f`A. B x)"
|
haftmann@32135
|
897 |
by auto
|
haftmann@32135
|
898 |
|
haftmann@32135
|
899 |
|
haftmann@32135
|
900 |
no_notation
|
haftmann@32135
|
901 |
less_eq (infix "\<sqsubseteq>" 50) and
|
haftmann@32135
|
902 |
less (infix "\<sqsubset>" 50) and
|
haftmann@41330
|
903 |
bot ("\<bottom>") and
|
haftmann@41330
|
904 |
top ("\<top>") and
|
haftmann@32135
|
905 |
inf (infixl "\<sqinter>" 70) and
|
haftmann@32135
|
906 |
sup (infixl "\<squnion>" 65) and
|
haftmann@32135
|
907 |
Inf ("\<Sqinter>_" [900] 900) and
|
haftmann@41330
|
908 |
Sup ("\<Squnion>_" [900] 900)
|
haftmann@32135
|
909 |
|
haftmann@41328
|
910 |
no_syntax (xsymbols)
|
haftmann@41330
|
911 |
"_INF1" :: "pttrns \<Rightarrow> 'b \<Rightarrow> 'b" ("(3\<Sqinter>_./ _)" [0, 10] 10)
|
haftmann@41330
|
912 |
"_INF" :: "pttrn \<Rightarrow> 'a set \<Rightarrow> 'b \<Rightarrow> 'b" ("(3\<Sqinter>_\<in>_./ _)" [0, 0, 10] 10)
|
haftmann@41328
|
913 |
"_SUP1" :: "pttrns \<Rightarrow> 'b \<Rightarrow> 'b" ("(3\<Squnion>_./ _)" [0, 10] 10)
|
haftmann@41328
|
914 |
"_SUP" :: "pttrn \<Rightarrow> 'a set \<Rightarrow> 'b \<Rightarrow> 'b" ("(3\<Squnion>_\<in>_./ _)" [0, 0, 10] 10)
|
haftmann@41328
|
915 |
|
haftmann@32135
|
916 |
lemmas mem_simps =
|
haftmann@32135
|
917 |
insert_iff empty_iff Un_iff Int_iff Compl_iff Diff_iff
|
haftmann@32135
|
918 |
mem_Collect_eq UN_iff Union_iff INT_iff Inter_iff
|
haftmann@32135
|
919 |
-- {* Each of these has ALREADY been added @{text "[simp]"} above. *}
|
haftmann@32135
|
920 |
|
haftmann@32135
|
921 |
end
|