| author | paulson |
| Wed, 08 May 1996 17:49:16 +0200 | |
| changeset 1733 | 89dd6ca7ee6c |
| parent 16 | 0b033d50ca1c |
| permissions | -rw-r--r-- |
| 0 | 1 |
(* Title: ZF/ex/contract.thy |
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ID: $Id$ |
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0b033d50ca1c
ex/{bin.ML,comb.ML,prop.ML}: replaced NewSext by Syntax.simple_sext
lcp
parents:
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diff
changeset
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Author: Lawrence C Paulson |
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Copyright 1993 University of Cambridge |
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Inductive definition of (1-step) contractions and (mult-step) reductions |
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*) |
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Contract0 = Comb + |
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consts |
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diamond :: "i => o" |
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I :: "i" |
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contract :: "i" |
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"-1->" :: "[i,i] => o" (infixl 50) |
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"--->" :: "[i,i] => o" (infixl 50) |
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parcontract :: "i" |
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"=1=>" :: "[i,i] => o" (infixl 50) |
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"===>" :: "[i,i] => o" (infixl 50) |
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translations |
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"p -1-> q" == "<p,q> : contract" |
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"p ---> q" == "<p,q> : contract^*" |
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"p =1=> q" == "<p,q> : parcontract" |
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"p ===> q" == "<p,q> : parcontract^+" |
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rules |
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diamond_def "diamond(r) == ALL x y. <x,y>:r --> \ |
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\ (ALL y'. <x,y'>:r --> \ |
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\ (EX z. <y,z>:r & <y',z> : r))" |
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I_def "I == S#K#K" |
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end |