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(* Title: HOL/IOA/example/Impl.thy
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by (Action.action.induct_tac "a" 1);
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ID: $Id$
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Author: Tobias Nipkow & Konrad Slind
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Copyright 1994 TU Muenchen
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The environment
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*)
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Env = IOA + Action +
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types
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'm env_state = "bool"
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(* give next bit to system *)
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consts
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env_asig :: 'm action signature
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env_trans :: ('m action, 'm env_state)transition set
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env_ioa :: ('m action, 'm env_state)ioa
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next :: 'm env_state => bool
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defs
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env_asig_def
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"env_asig == ({Next},
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UN m. {S_msg(m)},
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{})"
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env_trans_def "env_trans ==
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{tr. let s = fst(tr);
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t = snd(snd(tr))
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in case fst(snd(tr))
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of
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Next => t=True |
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S_msg(m) => s=True & t=False |
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R_msg(m) => False |
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S_pkt(pkt) => False |
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R_pkt(pkt) => False |
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S_ack(b) => False |
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R_ack(b) => False}"
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env_ioa_def "env_ioa ==
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(env_asig, {True}, env_trans)"
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end
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