# HG changeset patch
# User wenzelm
# Date 1204750095 -3600
# Node ID da9778392d8c2f995f4b3544cd30068a3d8d9add
# Parent  9625f3579b4851e9c5f442cc22e6f61c7c9548ca
explicit referencing of background facts;

diff -r 9625f3579b48 -r da9778392d8c src/HOL/Algebra/RingHom.thy
--- 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