# HG changeset patch # User paulson # Date 857141536 -3600 # Node ID dabe8ab631fadf9e90296fcd43f61ae9daf8ec60 # Parent 6d3d893453de42eda81f04d884701c00450315f9 Slightly more robust proof diff -r 6d3d893453de -r dabe8ab631fa src/ZF/upair.ML --- a/src/ZF/upair.ML Fri Feb 28 15:51:06 1997 +0100 +++ b/src/ZF/upair.ML Fri Feb 28 15:52:16 1997 +0100 @@ -76,7 +76,7 @@ (*Classical introduction rule: no commitment to A vs B*) qed_goal "UnCI" thy "(c ~: B ==> c : A) ==> c : A Un B" (fn prems=> - [ Simp_tac 1, fast_tac (!claset addIs prems) 1 ]); + [ Simp_tac 1, fast_tac (!claset addSIs prems) 1 ]); AddSIs [UnCI]; AddSEs [UnE];