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src/HOL/RealDef.thy
changeset 36349 39be26d1bc28
parent 35635 90fffd5ff996
child 36409 d323e7773aa8 
--- a/src/HOL/RealDef.thy	Mon Apr 26 11:34:15 2010 +0200
+++ b/src/HOL/RealDef.thy	Mon Apr 26 11:34:17 2010 +0200
@@ -279,7 +279,7 @@
 lemma INVERSE_ZERO: "inverse 0 = (0::real)"
 by (simp add: real_inverse_def)
 
-instance real :: division_by_zero
+instance real :: division_ring_inverse_zero
 proof
   show "inverse 0 = (0::real)" by (rule INVERSE_ZERO)
 qed
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