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src/HOL/Hilbert_Choice.thy
changeset 47988 e4b69e10b990
parent 46950 d0181abdbdac
child 48891 c0eafbd55de3 
--- a/src/HOL/Hilbert_Choice.thy	Thu May 24 17:05:30 2012 +0200
+++ b/src/HOL/Hilbert_Choice.thy	Thu May 24 17:25:53 2012 +0200
@@ -443,7 +443,7 @@
   have "h ` A = B"
   proof safe
     fix a assume "a \<in> A"
-    thus "h a \<in> B" using SUB1 2 3 by (case_tac "a \<in> A'", auto)
+    thus "h a \<in> B" using SUB1 2 3 by (cases "a \<in> A'") auto
   next
     fix b assume *: "b \<in> B"
     show "b \<in> h ` A"
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