src/FOL/ex/IffOracle.ML
Wed, 17 Mar 1999 16:33:47 +0100 wenzelm Theory.sign_of;
Thu, 09 Oct 1997 14:59:36 +0200 wenzelm removed declIffOracle;
Thu, 11 Jul 1996 15:02:42 +0200 paulson Modified to reject certain inputs -- illustrates error handling
Tue, 05 Mar 1996 11:38:41 +0100 paulson Example of declaring oracles
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