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src/HOL/Probability/Probability_Mass_Function.thy
changeset 70532 fcf3b891ccb1
parent 69597 ff784d5a5bfb
child 70817 dd675800469d 
--- a/src/HOL/Probability/Probability_Mass_Function.thy	Wed Aug 14 19:50:23 2019 +0200
+++ b/src/HOL/Probability/Probability_Mass_Function.thy	Thu Aug 15 16:11:56 2019 +0100
@@ -856,7 +856,7 @@
         have "integrable (map_pmf (to_nat_on M) M) (\<lambda>n. B)"
           by auto
         then show "summable (\<lambda>n. pmf (map_pmf (to_nat_on (set_pmf M)) M) n * B)"
-          by (simp add: measure_pmf_eq_density integrable_density integrable_count_space_nat_iff summable_rabs_cancel)
+          by (fastforce simp add: measure_pmf_eq_density integrable_density integrable_count_space_nat_iff summable_mult2)
       qed
     qed simp
   qed simp
isabelle