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src/Sequents/LK0.thy
changeset 58860 fee7cfa69c50
parent 55380 4de48353034e
child 58889 5b7a9633cfa8 
--- a/src/Sequents/LK0.thy	Sat Nov 01 11:40:55 2014 +0100
+++ b/src/Sequents/LK0.thy	Sat Nov 01 14:20:38 2014 +0100
@@ -359,7 +359,7 @@
   apply fast
   done
 
-lemma if_not_P: "|- ~P ==> |- (if P then x else y) = y";
+lemma if_not_P: "|- ~P ==> |- (if P then x else y) = y"
   apply (unfold If_def)
   apply (erule thinR [THEN cut])
   apply fast
isabelle