| author | oheimb |
| Mon, 21 Sep 1998 23:25:27 +0200 | |
| changeset 5526 | e7617b57a3e6 |
| parent 5313 | 1861a564d7e2 |
| child 5620 | 3ac11c4af76a |
| permissions | -rw-r--r-- |
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(* Title: HOL/UNITY/Constrains |
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ID: $Id$ |
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
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Copyright 1998 University of Cambridge |
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Safety relations: restricted to the set of reachable states. |
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*) |
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Constrains = UNITY + Traces + |
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constdefs |
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Constrains :: "['a program, 'a set, 'a set] => bool" |
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"Constrains prg A B == |
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constrains (Acts prg) |
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(reachable prg Int A) |
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(reachable prg Int B)" |
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Stable :: "'a program => 'a set => bool" |
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"Stable prg A == Constrains prg A A" |
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Unless :: "['a program, 'a set, 'a set] => bool" |
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"Unless prg A B == Constrains prg (A-B) (A Un B)" |
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Invariant :: "['a program, 'a set] => bool" |
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"Invariant prg A == (Init prg) <= A & Stable prg A" |
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end |