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src/HOL/Algebra/RingHom.thy
changeset 26204 da9778392d8c
parent 23464 bc2563c37b1a
child 27611 2c01c0bdb385 
--- a/src/HOL/Algebra/RingHom.thy	Wed Mar 05 21:42:21 2008 +0100
+++ b/src/HOL/Algebra/RingHom.thy	Wed Mar 05 21:48:15 2008 +0100
@@ -33,7 +33,7 @@
 lemma (in ring_hom_ring) is_ring_hom_ring:
   includes struct R + struct S
   shows "ring_hom_ring R S h"
-by fact
+by (rule ring_hom_ring_axioms)
 
 lemma ring_hom_ringI:
   includes ring R + ring S
isabelle