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src/HOL/Complex_Analysis/Conformal_Mappings.thy
changeset 82664 e9f3b94eb6a0
parent 82538 4b132ea7d575 
--- a/src/HOL/Complex_Analysis/Conformal_Mappings.thy	Sat May 24 09:06:26 2025 +0200
+++ b/src/HOL/Complex_Analysis/Conformal_Mappings.thy	Wed May 28 17:49:22 2025 +0200
@@ -723,7 +723,7 @@
     then have "(\<lambda>z. if z = \<xi> then deriv g \<xi> else (g z - g \<xi>) / (z - \<xi>)) holomorphic_on S"
       using \<xi> pole_lemma by blast
     then show ?thesis
-      using "\<section>" remove_def by fastforce
+      using "\<section>" by (smt (verit, best) DiffD2 singletonI) 
     qed
   ultimately show "?P = ?Q" and "?P = ?R"
     by meson+
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