| author | nipkow |
| Mon, 13 May 2002 15:27:28 +0200 | |
| changeset 13145 | 59bc43b51aa2 |
| parent 12919 | d6a0d168291e |
| child 13785 | e2fcd88be55d |
| permissions | -rw-r--r-- |
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(* Title: HOL/UNITY/Channel |
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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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Unordered Channel |
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From Misra, "A Logic for Concurrent Programming" (1994), section 13.3 |
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*) |
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Channel = WFair + |
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types state = nat set |
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consts |
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F :: state program |
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constdefs |
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minSet :: nat set => nat option |
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"minSet A == if A={} then None else Some (LEAST x. x:A)"
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rules |
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UC1 "F : (minSet -` {Some x}) co (minSet -` (Some`atLeast x))"
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(* UC1 "F : {s. minSet s = x} co {s. x <= minSet s}" *)
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UC2 "F : (minSet -` {Some x}) leadsTo {s. x ~: s}"
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end |