src/ZF/AC/WO1_WO7.thy
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(*  Title:      ZF/AC/WO1_WO7.thy
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    ID:         $Id$
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    Author:     Lawrence C Paulson, CU Computer Laboratory
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    Copyright   1998  University of Cambridge
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WO7 <-> LEMMA <-> WO1 (Rubin & Rubin p. 5)
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LEMMA is the sentence denoted by (**)
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*)
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WO1_WO7 = AC_Equiv +
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constdefs
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  LEMMA :: o
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    "LEMMA ==
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     \\<forall>X. ~Finite(X) --> (\\<exists>R. well_ord(X,R) & ~well_ord(X,converse(R)))"
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end