author | paulson |
Fri, 17 Jul 1998 11:13:43 +0200 | |
changeset 5156 | f23494fa8dc1 |
parent 2469 | b50b8c0eec01 |
child 6053 | 8a1059aa01f0 |
permissions | -rw-r--r-- |
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(* Title: ZF/AC.thy |
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ID: $Id$ |
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
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Copyright 1994 University of Cambridge |
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The Axiom of Choice |
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This definition comes from Halmos (1960), page 59. |
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*) |
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AC = func + |
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rules |
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AC "[| a: A; !!x. x:A ==> (EX y. y:B(x)) |] ==> EX z. z : Pi(A,B)" |
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end |