wenzelm@42830
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(* Title: Sequents/S43.thy
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paulson@2073
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Author: Martin Coen
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paulson@2073
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Copyright 1991 University of Cambridge
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paulson@2073
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paulson@2073
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This implements Rajeev Gore's sequent calculus for S43.
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paulson@2073
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*)
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paulson@2073
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wenzelm@17481
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theory S43
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imports Modal0
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begin
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consts
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S43pi :: "[seq'=>seq', seq'=>seq', seq'=>seq',
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paulson@2073
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seq'=>seq', seq'=>seq', seq'=>seq'] => prop"
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wenzelm@14765
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syntax
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wenzelm@35116
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"_S43pi" :: "[seq, seq, seq, seq, seq, seq] => prop"
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paulson@2073
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("S43pi((_);(_);(_);(_);(_);(_))" [] 5)
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paulson@2073
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wenzelm@35116
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parse_translation {*
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let
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val tr = seq_tr;
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fun s43pi_tr [s1, s2, s3, s4, s5, s6] =
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Const (@{const_syntax S43pi}, dummyT) $ tr s1 $ tr s2 $ tr s3 $ tr s4 $ tr s5 $ tr s6;
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in [(@{syntax_const "_S43pi"}, s43pi_tr)] end
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*}
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print_translation {*
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let
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val tr' = seq_tr';
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fun s43pi_tr' [s1, s2, s3, s4, s5, s6] =
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Const(@{syntax_const "_S43pi"}, dummyT) $ tr' s1 $ tr' s2 $ tr' s3 $ tr' s4 $ tr' s5 $ tr' s6;
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in [(@{const_syntax S43pi}, s43pi_tr')] end
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*}
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wenzelm@52446
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axiomatization where
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(* Definition of the star operation using a set of Horn clauses *)
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(* For system S43: gamma * == {[]P | []P : gamma} *)
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(* delta * == {<>P | <>P : delta} *)
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lstar0: "|L>" and
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lstar1: "$G |L> $H ==> []P, $G |L> []P, $H" and
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lstar2: "$G |L> $H ==> P, $G |L> $H" and
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rstar0: "|R>" and
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rstar1: "$G |R> $H ==> <>P, $G |R> <>P, $H" and
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rstar2: "$G |R> $H ==> P, $G |R> $H" and
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(* Set of Horn clauses to generate the antecedents for the S43 pi rule *)
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(* ie *)
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(* S1...Sk,Sk+1...Sk+m *)
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(* ---------------------------------- *)
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(* <>P1...<>Pk, $G |- $H, []Q1...[]Qm *)
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(* *)
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(* where Si == <>P1...<>Pi-1,<>Pi+1,..<>Pk,Pi, $G * |- $H *, []Q1...[]Qm *)
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(* and Sj == <>P1...<>Pk, $G * |- $H *, []Q1...[]Qj-1,[]Qj+1...[]Qm,Qj *)
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(* and 1<=i<=k and k<j<=k+m *)
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S43pi0: "S43pi $L;; $R;; $Lbox; $Rdia" and
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S43pi1:
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"[| (S43pi <>P,$L'; $L;; $R; $Lbox;$Rdia); $L',P,$L,$Lbox |- $R,$Rdia |] ==>
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S43pi $L'; <>P,$L;; $R; $Lbox;$Rdia" and
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S43pi2:
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"[| (S43pi $L';; []P,$R'; $R; $Lbox;$Rdia); $L',$Lbox |- $R',P,$R,$Rdia |] ==>
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wenzelm@52446
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S43pi $L';; $R'; []P,$R; $Lbox;$Rdia" and
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(* Rules for [] and <> for S43 *)
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boxL: "$E, P, $F, []P |- $G ==> $E, []P, $F |- $G" and
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diaR: "$E |- $F, P, $G, <>P ==> $E |- $F, <>P, $G" and
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pi1:
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"[| $L1,<>P,$L2 |L> $Lbox; $L1,<>P,$L2 |R> $Ldia; $R |L> $Rbox; $R |R> $Rdia;
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S43pi ; $Ldia;; $Rbox; $Lbox; $Rdia |] ==>
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$L1, <>P, $L2 |- $R" and
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pi2:
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"[| $L |L> $Lbox; $L |R> $Ldia; $R1,[]P,$R2 |L> $Rbox; $R1,[]P,$R2 |R> $Rdia;
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S43pi ; $Ldia;; $Rbox; $Lbox; $Rdia |] ==>
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$L |- $R1, []P, $R2"
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ML {*
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structure S43_Prover = Modal_ProverFun
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(
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val rewrite_rls = @{thms rewrite_rls}
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val safe_rls = @{thms safe_rls}
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val unsafe_rls = @{thms unsafe_rls} @ [@{thm pi1}, @{thm pi2}]
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val bound_rls = @{thms bound_rls} @ [@{thm boxL}, @{thm diaR}]
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val aside_rls = [@{thm lstar0}, @{thm lstar1}, @{thm lstar2}, @{thm rstar0},
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@{thm rstar1}, @{thm rstar2}, @{thm S43pi0}, @{thm S43pi1}, @{thm S43pi2}]
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)
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*}
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method_setup S43_solve = {*
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Scan.succeed (K (SIMPLE_METHOD
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(S43_Prover.solve_tac 2 ORELSE S43_Prover.solve_tac 3)))
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wenzelm@43685
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*}
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(* Theorems of system T from Hughes and Cresswell and Hailpern, LNCS 129 *)
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lemma "|- []P --> P" by S43_solve
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lemma "|- [](P-->Q) --> ([]P-->[]Q)" by S43_solve (* normality*)
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wenzelm@21426
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lemma "|- (P--<Q) --> []P --> []Q" by S43_solve
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wenzelm@21426
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lemma "|- P --> <>P" by S43_solve
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wenzelm@21426
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wenzelm@21426
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lemma "|- [](P & Q) <-> []P & []Q" by S43_solve
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wenzelm@21426
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lemma "|- <>(P | Q) <-> <>P | <>Q" by S43_solve
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wenzelm@21426
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lemma "|- [](P<->Q) <-> (P>-<Q)" by S43_solve
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wenzelm@21426
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lemma "|- <>(P-->Q) <-> ([]P--><>Q)" by S43_solve
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wenzelm@21426
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lemma "|- []P <-> ~<>(~P)" by S43_solve
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wenzelm@21426
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lemma "|- [](~P) <-> ~<>P" by S43_solve
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wenzelm@21426
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lemma "|- ~[]P <-> <>(~P)" by S43_solve
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wenzelm@21426
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lemma "|- [][]P <-> ~<><>(~P)" by S43_solve
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wenzelm@21426
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lemma "|- ~<>(P | Q) <-> ~<>P & ~<>Q" by S43_solve
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lemma "|- []P | []Q --> [](P | Q)" by S43_solve
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lemma "|- <>(P & Q) --> <>P & <>Q" by S43_solve
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wenzelm@21426
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lemma "|- [](P | Q) --> []P | <>Q" by S43_solve
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wenzelm@21426
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lemma "|- <>P & []Q --> <>(P & Q)" by S43_solve
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wenzelm@21426
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lemma "|- [](P | Q) --> <>P | []Q" by S43_solve
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wenzelm@21426
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lemma "|- <>(P-->(Q & R)) --> ([]P --> <>Q) & ([]P--><>R)" by S43_solve
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wenzelm@21426
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lemma "|- (P--<Q) & (Q--<R) --> (P--<R)" by S43_solve
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lemma "|- []P --> <>Q --> <>(P & Q)" by S43_solve
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(* Theorems of system S4 from Hughes and Cresswell, p.46 *)
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lemma "|- []A --> A" by S43_solve (* refexivity *)
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lemma "|- []A --> [][]A" by S43_solve (* transitivity *)
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lemma "|- []A --> <>A" by S43_solve (* seriality *)
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lemma "|- <>[](<>A --> []<>A)" by S43_solve
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lemma "|- <>[](<>[]A --> []A)" by S43_solve
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lemma "|- []P <-> [][]P" by S43_solve
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lemma "|- <>P <-> <><>P" by S43_solve
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lemma "|- <>[]<>P --> <>P" by S43_solve
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lemma "|- []<>P <-> []<>[]<>P" by S43_solve
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lemma "|- <>[]P <-> <>[]<>[]P" by S43_solve
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(* Theorems for system S4 from Hughes and Cresswell, p.60 *)
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lemma "|- []P | []Q <-> []([]P | []Q)" by S43_solve
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lemma "|- ((P>-<Q) --< R) --> ((P>-<Q) --< []R)" by S43_solve
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(* These are from Hailpern, LNCS 129 *)
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lemma "|- [](P & Q) <-> []P & []Q" by S43_solve
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wenzelm@21426
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lemma "|- <>(P | Q) <-> <>P | <>Q" by S43_solve
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wenzelm@21426
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lemma "|- <>(P --> Q) <-> ([]P --> <>Q)" by S43_solve
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wenzelm@21426
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lemma "|- [](P --> Q) --> (<>P --> <>Q)" by S43_solve
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wenzelm@21426
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lemma "|- []P --> []<>P" by S43_solve
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wenzelm@21426
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lemma "|- <>[]P --> <>P" by S43_solve
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lemma "|- []P | []Q --> [](P | Q)" by S43_solve
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wenzelm@21426
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lemma "|- <>(P & Q) --> <>P & <>Q" by S43_solve
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wenzelm@21426
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lemma "|- [](P | Q) --> []P | <>Q" by S43_solve
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wenzelm@21426
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lemma "|- <>P & []Q --> <>(P & Q)" by S43_solve
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wenzelm@21426
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lemma "|- [](P | Q) --> <>P | []Q" by S43_solve
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(* Theorems of system S43 *)
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lemma "|- <>[]P --> []<>P" by S43_solve
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lemma "|- <>[]P --> [][]<>P" by S43_solve
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wenzelm@21426
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lemma "|- [](<>P | <>Q) --> []<>P | []<>Q" by S43_solve
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wenzelm@21426
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lemma "|- <>[]P & <>[]Q --> <>([]P & []Q)" by S43_solve
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wenzelm@21426
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lemma "|- []([]P --> []Q) | []([]Q --> []P)" by S43_solve
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wenzelm@21426
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lemma "|- [](<>P --> <>Q) | [](<>Q --> <>P)" by S43_solve
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wenzelm@21426
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lemma "|- []([]P --> Q) | []([]Q --> P)" by S43_solve
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wenzelm@21426
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lemma "|- [](P --> <>Q) | [](Q --> <>P)" by S43_solve
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wenzelm@21426
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lemma "|- [](P --> []Q-->R) | [](P | ([]R --> Q))" by S43_solve
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wenzelm@21426
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lemma "|- [](P | (Q --> <>C)) | [](P --> C --> <>Q)" by S43_solve
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wenzelm@21426
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lemma "|- []([]P | Q) & [](P | []Q) --> []P | []Q" by S43_solve
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wenzelm@21426
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lemma "|- <>P & <>Q --> <>(<>P & Q) | <>(P & <>Q)" by S43_solve
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wenzelm@21426
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lemma "|- [](P | Q) & []([]P | Q) & [](P | []Q) --> []P | []Q" by S43_solve
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wenzelm@21426
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lemma "|- <>P & <>Q --> <>(P & Q) | <>(<>P & Q) | <>(P & <>Q)" by S43_solve
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wenzelm@21426
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lemma "|- <>[]<>P <-> []<>P" by S43_solve
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wenzelm@21426
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lemma "|- []<>[]P <-> <>[]P" by S43_solve
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(* These are from Hailpern, LNCS 129 *)
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lemma "|- [](P & Q) <-> []P & []Q" by S43_solve
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wenzelm@21426
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lemma "|- <>(P | Q) <-> <>P | <>Q" by S43_solve
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wenzelm@21426
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lemma "|- <>(P --> Q) <-> []P --> <>Q" by S43_solve
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wenzelm@21426
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wenzelm@21426
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lemma "|- [](P --> Q) --> <>P --> <>Q" by S43_solve
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wenzelm@21426
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lemma "|- []P --> []<>P" by S43_solve
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wenzelm@21426
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lemma "|- <>[]P --> <>P" by S43_solve
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wenzelm@21426
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lemma "|- []<>[]P --> []<>P" by S43_solve
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wenzelm@21426
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lemma "|- <>[]P --> <>[]<>P" by S43_solve
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wenzelm@21426
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lemma "|- <>[]P --> []<>P" by S43_solve
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wenzelm@21426
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lemma "|- []<>[]P <-> <>[]P" by S43_solve
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wenzelm@21426
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lemma "|- <>[]<>P <-> []<>P" by S43_solve
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wenzelm@21426
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wenzelm@21426
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lemma "|- []P | []Q --> [](P | Q)" by S43_solve
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wenzelm@21426
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lemma "|- <>(P & Q) --> <>P & <>Q" by S43_solve
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wenzelm@21426
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lemma "|- [](P | Q) --> []P | <>Q" by S43_solve
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wenzelm@21426
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lemma "|- <>P & []Q --> <>(P & Q)" by S43_solve
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wenzelm@21426
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lemma "|- [](P | Q) --> <>P | []Q" by S43_solve
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wenzelm@21426
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lemma "|- [](P | Q) --> []<>P | []<>Q" by S43_solve
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wenzelm@21426
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lemma "|- <>[]P & <>[]Q --> <>(P & Q)" by S43_solve
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wenzelm@21426
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lemma "|- <>[](P & Q) <-> <>[]P & <>[]Q" by S43_solve
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wenzelm@21426
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lemma "|- []<>(P | Q) <-> []<>P | []<>Q" by S43_solve
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wenzelm@17481
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paulson@2073
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end
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