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src/HOL/Probability/Borel_Space.thy
changeset 41545 9c869baf1c66
parent 41097 a1abfa4e2b44
child 41830 719b0a517c33 
--- a/src/HOL/Probability/Borel_Space.thy	Fri Jan 14 14:21:48 2011 +0100
+++ b/src/HOL/Probability/Borel_Space.thy	Fri Jan 14 15:56:42 2011 +0100
@@ -170,7 +170,7 @@
 qed
 
 lemma (in sigma_algebra) borel_measurable_subalgebra:
-  assumes "N \<subseteq> sets M" "f \<in> borel_measurable (M\<lparr>sets:=N\<rparr>)"
+  assumes "sets N \<subseteq> sets M" "space N = space M" "f \<in> borel_measurable N"
   shows "f \<in> borel_measurable M"
   using assms unfolding measurable_def by auto
isabelle