src/HOL/ex/LexProd.thy
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(*  Title: 	HOL/ex/lex-prod.thy
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    ID:         $Id$
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    Author: 	Tobias Nipkow, TU Munich
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    Copyright   1993  TU Munich
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The lexicographic product of two relations.
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*)
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LexProd = WF + Prod +
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consts "**" :: "[('a*'a)set, ('b*'b)set] => (('a*'b)*('a*'b))set" (infixl 70)
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rules
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lex_prod_def "ra**rb == {p. ? a a' b b'. 
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	p = ((a,b),(a',b')) & ((a,a') : ra | a=a' & (b,b') : rb)}"
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end
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