src/HOL/IOA/Asig.thy
author wenzelm
Sat, 07 Apr 2012 16:41:59 +0200
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explicit checks stable_finished_theory/stable_command allow parallel asynchronous command transactions; tuned;
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(*  Title:      HOL/IOA/Asig.thy
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    Author:     Tobias Nipkow & Konrad Slind
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    Copyright   1994  TU Muenchen
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*)
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header {* Action signatures *}
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theory Asig
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imports Main
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begin
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type_synonym
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  'a signature = "('a set * 'a set * 'a set)"
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consts
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  "actions" :: "'action signature => 'action set"
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  "inputs" :: "'action signature => 'action set"
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  "outputs" :: "'action signature => 'action set"
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  "internals" :: "'action signature => 'action set"
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  externals :: "'action signature => 'action set"
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  is_asig       ::"'action signature => bool"
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  mk_ext_asig   ::"'action signature => 'action signature"
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defs
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asig_inputs_def:    "inputs == fst"
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asig_outputs_def:   "outputs == (fst o snd)"
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asig_internals_def: "internals == (snd o snd)"
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actions_def:
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   "actions(asig) == (inputs(asig) Un outputs(asig) Un internals(asig))"
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externals_def:
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   "externals(asig) == (inputs(asig) Un outputs(asig))"
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is_asig_def:
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  "is_asig(triple) ==
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      ((inputs(triple) Int outputs(triple) = {})    &
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       (outputs(triple) Int internals(triple) = {}) &
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       (inputs(triple) Int internals(triple) = {}))"
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mk_ext_asig_def:
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  "mk_ext_asig(triple) == (inputs(triple), outputs(triple), {})"
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lemmas asig_projections = asig_inputs_def asig_outputs_def asig_internals_def
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lemma int_and_ext_is_act: "[| a~:internals(S) ;a~:externals(S)|] ==> a~:actions(S)"
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  apply (simp add: externals_def actions_def)
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  done
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lemma ext_is_act: "[|a:externals(S)|] ==> a:actions(S)"
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  apply (simp add: externals_def actions_def)
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  done
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end