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src/HOL/Algebra/Left_Coset.thy
changeset 82802 547335b41005
parent 81142 6ad2c917dd2e 
--- a/src/HOL/Algebra/Left_Coset.thy	Tue Jul 01 20:51:26 2025 +0200
+++ b/src/HOL/Algebra/Left_Coset.thy	Thu Jul 03 13:53:14 2025 +0200
@@ -95,7 +95,7 @@
 
 lemma (in group) inj_on_f'':
     "\<lbrakk>H \<subseteq> carrier G;  a \<in> carrier G\<rbrakk> \<Longrightarrow> inj_on (\<lambda>y. inv a \<otimes> y) (a <# H)"
-  by (meson inj_on_cmult inv_closed l_coset_subset_G subset_inj_on)
+  by (meson inj_on_cmult inv_closed l_coset_subset_G inj_on_subset)
 
 lemma (in group) inj_on_g':
     "\<lbrakk>H \<subseteq> carrier G;  a \<in> carrier G\<rbrakk> \<Longrightarrow> inj_on (\<lambda>y. a \<otimes> y) H"
isabelle