
diff -r 8a1c6c7909c9 -r d47c8a89c6a5 src/HOL/Library/Sublist.thy
--- a/src/HOL/Library/Sublist.thy	Tue Mar 09 11:50:11 2021 +0100
+++ b/src/HOL/Library/Sublist.thy	Tue Mar 09 11:50:21 2021 +0100
@@ -1385,12 +1385,6 @@
     by (simp add: ys zs1 zs2)
 qed
 
-lemma sublist_list_all: "sublist xs ys \<Longrightarrow> list_all P ys \<Longrightarrow> list_all P xs"
-  by (auto simp: sublist_def)
-
-lemmas prefix_list_all = prefix_imp_sublist[THEN sublist_list_all]
-lemmas suffix_list_all = suffix_imp_sublist[THEN sublist_list_all]
-
 subsubsection \<open>\<open>sublists\<close>\<close>
 
 primrec sublists :: "'a list \<Rightarrow> 'a list list" where




