ex/Finite.thy
author clasohm
Wed, 02 Mar 1994 12:26:55 +0100
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Finite = Lfp +
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consts Fin :: "'a set => 'a set set"
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rules
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 Fin_def "Fin(A) == lfp(%F. insert({}, UN x:A. insert(x)``F))"
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end