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\begin{isabellebody}%
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\def\isabellecontext{ML{\isacharunderscore}Tactic}%
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%
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\isadelimtheory
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\isanewline
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\isanewline
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%
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\endisadelimtheory
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%
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\isatagtheory
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\isacommand{theory}\isamarkupfalse%
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\ ML{\isacharunderscore}Tactic\isanewline
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\isakeyword{imports}\ Main\isanewline
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\isakeyword{begin}%
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\endisatagtheory
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{\isafoldtheory}%
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%
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\isadelimtheory
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%
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\endisadelimtheory
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%
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\isamarkupchapter{ML tactic expressions \label{sec:conv-tac}%
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}
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\isamarkuptrue%
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%
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\begin{isamarkuptext}%
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Isar Proof methods closely resemble traditional tactics, when used
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in unstructured sequences of \mbox{\isa{\isacommand{apply}}} commands.
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Isabelle/Isar provides emulations for all major ML tactics of
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classic Isabelle --- mostly for the sake of easy porting of existing
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developments, as actual Isar proof texts would demand much less
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diversity of proof methods.
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Unlike tactic expressions in ML, Isar proof methods provide proper
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concrete syntax for additional arguments, options, modifiers etc.
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Thus a typical method text is usually more concise than the
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corresponding ML tactic. Furthermore, the Isar versions of classic
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Isabelle tactics often cover several variant forms by a single
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method with separate options to tune the behavior. For example,
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method \mbox{\isa{simp}} replaces all of \verb|simp_tac|~/ \verb|asm_simp_tac|~/ \verb|full_simp_tac|~/ \verb|asm_full_simp_tac|, there
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is also concrete syntax for augmenting the Simplifier context (the
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current ``simpset'') in a convenient way.%
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\end{isamarkuptext}%
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\isamarkuptrue%
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%
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\isamarkupsection{Resolution tactics%
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}
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\isamarkuptrue%
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%
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\begin{isamarkuptext}%
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Classic Isabelle provides several variant forms of tactics for
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single-step rule applications (based on higher-order resolution).
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The space of resolution tactics has the following main dimensions.
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\begin{enumerate}
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\item The ``mode'' of resolution: intro, elim, destruct, or forward
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(e.g.\ \verb|resolve_tac|, \verb|eresolve_tac|, \verb|dresolve_tac|,
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\verb|forward_tac|).
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\item Optional explicit instantiation (e.g.\ \verb|resolve_tac| vs.\
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\verb|res_inst_tac|).
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\item Abbreviations for singleton arguments (e.g.\ \verb|resolve_tac|
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vs.\ \verb|rtac|).
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\end{enumerate}
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Basically, the set of Isar tactic emulations \mbox{\isa{rule{\isacharunderscore}tac}},
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\mbox{\isa{erule{\isacharunderscore}tac}}, \mbox{\isa{drule{\isacharunderscore}tac}}, \mbox{\isa{frule{\isacharunderscore}tac}} (see
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\secref{sec:tactics}) would be sufficient to cover the four modes,
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either with or without instantiation, and either with single or
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multiple arguments. Although it is more convenient in most cases to
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use the plain \mbox{\isa{rule}} method (see
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\secref{sec:pure-meth-att}), or any of its ``improper'' variants
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\mbox{\isa{erule}}, \mbox{\isa{drule}}, \mbox{\isa{frule}} (see
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\secref{sec:misc-meth-att}). Note that explicit goal addressing is
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only supported by the actual \mbox{\isa{rule{\isacharunderscore}tac}} version.
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With this in mind, plain resolution tactics correspond to Isar
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methods as follows.
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\medskip
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\begin{tabular}{lll}
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\verb|rtac|~\isa{{\isachardoublequote}a\ {\isadigit{1}}{\isachardoublequote}} & & \isa{{\isachardoublequote}rule\ a{\isachardoublequote}} \\
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\verb|resolve_tac|~\isa{{\isachardoublequote}{\isacharbrackleft}a\isactrlsub {\isadigit{1}}{\isacharcomma}\ {\isasymdots}{\isacharbrackright}\ {\isadigit{1}}{\isachardoublequote}} & & \isa{{\isachardoublequote}rule\ a\isactrlsub {\isadigit{1}}\ {\isasymdots}{\isachardoublequote}} \\
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\verb|res_inst_tac|~\isa{{\isachardoublequote}{\isacharbrackleft}{\isacharparenleft}x\isactrlsub {\isadigit{1}}{\isacharcomma}\ t\isactrlsub {\isadigit{1}}{\isacharparenright}{\isacharcomma}\ {\isasymdots}{\isacharbrackright}\ a\ {\isadigit{1}}{\isachardoublequote}} & &
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\isa{{\isachardoublequote}rule{\isacharunderscore}tac\ x\isactrlsub {\isadigit{1}}\ {\isacharequal}\ t\isactrlsub {\isadigit{1}}\ {\isasymAND}\ {\isasymdots}\ {\isasymIN}\ a{\isachardoublequote}} \\[0.5ex]
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\verb|rtac|~\isa{{\isachardoublequote}a\ i{\isachardoublequote}} & & \isa{{\isachardoublequote}rule{\isacharunderscore}tac\ {\isacharbrackleft}i{\isacharbrackright}\ a{\isachardoublequote}} \\
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\verb|resolve_tac|~\isa{{\isachardoublequote}{\isacharbrackleft}a\isactrlsub {\isadigit{1}}{\isacharcomma}\ {\isasymdots}{\isacharbrackright}\ i{\isachardoublequote}} & & \isa{{\isachardoublequote}rule{\isacharunderscore}tac\ {\isacharbrackleft}i{\isacharbrackright}\ a\isactrlsub {\isadigit{1}}\ {\isasymdots}{\isachardoublequote}} \\
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\verb|res_inst_tac|~\isa{{\isachardoublequote}{\isacharbrackleft}{\isacharparenleft}x\isactrlsub {\isadigit{1}}{\isacharcomma}\ t\isactrlsub {\isadigit{1}}{\isacharparenright}{\isacharcomma}\ {\isasymdots}{\isacharbrackright}\ a\ i{\isachardoublequote}} & &
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\isa{{\isachardoublequote}rule{\isacharunderscore}tac\ {\isacharbrackleft}i{\isacharbrackright}\ x\isactrlsub {\isadigit{1}}\ {\isacharequal}\ t\isactrlsub {\isadigit{1}}\ {\isasymAND}\ {\isasymdots}\ {\isasymIN}\ a{\isachardoublequote}} \\
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\end{tabular}
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\medskip
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Note that explicit goal addressing may be usually avoided by
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changing the order of subgoals with \mbox{\isa{\isacommand{defer}}} or \mbox{\isa{\isacommand{prefer}}} (see \secref{sec:tactic-commands}).%
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\end{isamarkuptext}%
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\isamarkuptrue%
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%
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\isamarkupsection{Simplifier tactics%
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}
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\isamarkuptrue%
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%
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\begin{isamarkuptext}%
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The main Simplifier tactics \verb|simp_tac| and variants (cf.\
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\cite{isabelle-ref}) are all covered by the \mbox{\isa{simp}} and
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\mbox{\isa{simp{\isacharunderscore}all}} methods (see \secref{sec:simplifier}). Note that
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there is no individual goal addressing available, simplification
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acts either on the first goal (\mbox{\isa{simp}}) or all goals
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(\mbox{\isa{simp{\isacharunderscore}all}}).
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\medskip
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\begin{tabular}{lll}
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\verb|asm_full_simp_tac|~\isa{{\isachardoublequote}{\isacharat}{\isacharbraceleft}simpset{\isacharbraceright}\ {\isadigit{1}}{\isachardoublequote}} & & \mbox{\isa{simp}} \\
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\verb|ALLGOALS|~(\verb|asm_full_simp_tac|~\isa{{\isachardoublequote}{\isacharat}{\isacharbraceleft}simpset{\isacharbraceright}{\isachardoublequote}}) & & \mbox{\isa{simp{\isacharunderscore}all}} \\[0.5ex]
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\verb|simp_tac|~\isa{{\isachardoublequote}{\isacharat}{\isacharbraceleft}simpset{\isacharbraceright}\ {\isadigit{1}}{\isachardoublequote}} & & \mbox{\isa{simp}}~\isa{{\isachardoublequote}{\isacharparenleft}no{\isacharunderscore}asm{\isacharparenright}{\isachardoublequote}} \\
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\verb|asm_simp_tac|~\isa{{\isachardoublequote}{\isacharat}{\isacharbraceleft}simpset{\isacharbraceright}\ {\isadigit{1}}{\isachardoublequote}} & & \mbox{\isa{simp}}~\isa{{\isachardoublequote}{\isacharparenleft}no{\isacharunderscore}asm{\isacharunderscore}simp{\isacharparenright}{\isachardoublequote}} \\
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\verb|full_simp_tac|~\isa{{\isachardoublequote}{\isacharat}{\isacharbraceleft}simpset{\isacharbraceright}\ {\isadigit{1}}{\isachardoublequote}} & & \mbox{\isa{simp}}~\isa{{\isachardoublequote}{\isacharparenleft}no{\isacharunderscore}asm{\isacharunderscore}use{\isacharparenright}{\isachardoublequote}} \\
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\verb|asm_lr_simp_tac|~\isa{{\isachardoublequote}{\isacharat}{\isacharbraceleft}simpset{\isacharbraceright}\ {\isadigit{1}}{\isachardoublequote}} & & \mbox{\isa{simp}}~\isa{{\isachardoublequote}{\isacharparenleft}asm{\isacharunderscore}lr{\isacharparenright}{\isachardoublequote}} \\
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\end{tabular}
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\medskip%
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\end{isamarkuptext}%
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\isamarkuptrue%
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%
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\isamarkupsection{Classical Reasoner tactics%
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}
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\isamarkuptrue%
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%
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\begin{isamarkuptext}%
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The Classical Reasoner provides a rather large number of variations
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of automated tactics, such as \verb|blast_tac|, \verb|fast_tac|, \verb|clarify_tac| etc.\ (see \cite{isabelle-ref}). The corresponding
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Isar methods usually share the same base name, such as \mbox{\isa{blast}}, \mbox{\isa{fast}}, \mbox{\isa{clarify}} etc.\ (see
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\secref{sec:classical}).%
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\end{isamarkuptext}%
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\isamarkuptrue%
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%
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\isamarkupsection{Miscellaneous tactics%
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}
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\isamarkuptrue%
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%
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\begin{isamarkuptext}%
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There are a few additional tactics defined in various theories of
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Isabelle/HOL, some of these also in Isabelle/FOL or Isabelle/ZF.
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The most common ones of these may be ported to Isar as follows.
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\medskip
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\begin{tabular}{lll}
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\verb|stac|~\isa{{\isachardoublequote}a\ {\isadigit{1}}{\isachardoublequote}} & & \isa{{\isachardoublequote}subst\ a{\isachardoublequote}} \\
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\verb|hyp_subst_tac|~\isa{{\isadigit{1}}} & & \isa{hypsubst} \\
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\verb|strip_tac|~\isa{{\isadigit{1}}} & \isa{{\isachardoublequote}{\isasymapprox}{\isachardoublequote}} & \isa{{\isachardoublequote}intro\ strip{\isachardoublequote}} \\
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\verb|split_all_tac|~\isa{{\isadigit{1}}} & & \isa{{\isachardoublequote}simp\ {\isacharparenleft}no{\isacharunderscore}asm{\isacharunderscore}simp{\isacharparenright}\ only{\isacharcolon}\ split{\isacharunderscore}tupled{\isacharunderscore}all{\isachardoublequote}} \\
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& \isa{{\isachardoublequote}{\isasymapprox}{\isachardoublequote}} & \isa{{\isachardoublequote}simp\ only{\isacharcolon}\ split{\isacharunderscore}tupled{\isacharunderscore}all{\isachardoublequote}} \\
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& \isa{{\isachardoublequote}{\isasymlless}{\isachardoublequote}} & \isa{{\isachardoublequote}clarify{\isachardoublequote}} \\
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\end{tabular}%
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\end{isamarkuptext}%
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\isamarkuptrue%
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%
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\isamarkupsection{Tacticals%
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}
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\isamarkuptrue%
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%
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\begin{isamarkuptext}%
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Classic Isabelle provides a huge amount of tacticals for combination
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and modification of existing tactics. This has been greatly reduced
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in Isar, providing the bare minimum of combinators only: ``\isa{{\isachardoublequote}{\isacharcomma}{\isachardoublequote}}'' (sequential composition), ``\isa{{\isachardoublequote}{\isacharbar}{\isachardoublequote}}'' (alternative
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choices), ``\isa{{\isachardoublequote}{\isacharquery}{\isachardoublequote}}'' (try), ``\isa{{\isachardoublequote}{\isacharplus}{\isachardoublequote}}'' (repeat at least
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once). These are usually sufficient in practice; if all fails,
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arbitrary ML tactic code may be invoked via the \mbox{\isa{tactic}}
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method (see \secref{sec:tactics}).
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\medskip Common ML tacticals may be expressed directly in Isar as
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follows:
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\medskip
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\begin{tabular}{lll}
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\isa{{\isachardoublequote}tac\isactrlsub {\isadigit{1}}{\isachardoublequote}}~\verb|THEN|~\isa{{\isachardoublequote}tac\isactrlsub {\isadigit{2}}{\isachardoublequote}} & & \isa{{\isachardoublequote}meth\isactrlsub {\isadigit{1}}{\isacharcomma}\ meth\isactrlsub {\isadigit{2}}{\isachardoublequote}} \\
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\isa{{\isachardoublequote}tac\isactrlsub {\isadigit{1}}{\isachardoublequote}}~\verb|ORELSE|~\isa{{\isachardoublequote}tac\isactrlsub {\isadigit{2}}{\isachardoublequote}} & & \isa{{\isachardoublequote}meth\isactrlsub {\isadigit{1}}\ {\isacharbar}\ meth\isactrlsub {\isadigit{2}}{\isachardoublequote}} \\
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\verb|TRY|~\isa{tac} & & \isa{{\isachardoublequote}meth{\isacharquery}{\isachardoublequote}} \\
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\verb|REPEAT1|~\isa{tac} & & \isa{{\isachardoublequote}meth{\isacharplus}{\isachardoublequote}} \\
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\verb|REPEAT|~\isa{tac} & & \isa{{\isachardoublequote}{\isacharparenleft}meth{\isacharplus}{\isacharparenright}{\isacharquery}{\isachardoublequote}} \\
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\verb|EVERY|~\isa{{\isachardoublequote}{\isacharbrackleft}tac\isactrlsub {\isadigit{1}}{\isacharcomma}\ {\isasymdots}{\isacharbrackright}{\isachardoublequote}} & & \isa{{\isachardoublequote}meth\isactrlsub {\isadigit{1}}{\isacharcomma}\ {\isasymdots}{\isachardoublequote}} \\
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\verb|FIRST|~\isa{{\isachardoublequote}{\isacharbrackleft}tac\isactrlsub {\isadigit{1}}{\isacharcomma}\ {\isasymdots}{\isacharbrackright}{\isachardoublequote}} & & \isa{{\isachardoublequote}meth\isactrlsub {\isadigit{1}}\ {\isacharbar}\ {\isasymdots}{\isachardoublequote}} \\
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\end{tabular}
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\medskip
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\medskip \verb|CHANGED| (see \cite{isabelle-ref}) is usually not
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required in Isar, since most basic proof methods already fail unless
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there is an actual change in the goal state. Nevertheless, ``\isa{{\isachardoublequote}{\isacharquery}{\isachardoublequote}}'' (try) may be used to accept \emph{unchanged} results as
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well.
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\medskip \verb|ALLGOALS|, \verb|SOMEGOAL| etc.\ (see
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\cite{isabelle-ref}) are not available in Isar, since there is no
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direct goal addressing. Nevertheless, some basic methods address
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all goals internally, notably \mbox{\isa{simp{\isacharunderscore}all}} (see
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\secref{sec:simplifier}). Also note that \verb|ALLGOALS| can be
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often replaced by ``\isa{{\isachardoublequote}{\isacharplus}{\isachardoublequote}}'' (repeat at least once), although
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this usually has a different operational behavior, such as solving
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goals in a different order.
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\medskip Iterated resolution, such as \verb|REPEAT (FIRSTGOAL|\isasep\isanewline%
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\verb| (resolve_tac \<dots>))|, is usually better expressed using the \mbox{\isa{intro}} and \mbox{\isa{elim}} methods of Isar (see
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\secref{sec:classical}).%
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\end{isamarkuptext}%
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\isamarkuptrue%
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%
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\isadelimtheory
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%
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\endisadelimtheory
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%
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\isatagtheory
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\isacommand{end}\isamarkupfalse%
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%
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\endisatagtheory
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{\isafoldtheory}%
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%
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\isadelimtheory
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%
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\endisadelimtheory
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\isanewline
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\end{isabellebody}%
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%%% Local Variables:
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%%% mode: latex
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%%% TeX-master: "root"
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%%% End:
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