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Commit dbecfff0 authored by StepanHolub's avatar StepanHolub
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......@@ -989,6 +989,8 @@
section \<open>Primitivity preserving morphisms\<close>
(* by Martin Raška *)
locale primitivity_preserving_morphism = nonerasing_morphism +
assumes prim_morph : "2 \<le> \<^bold>|u\<^bold>| \<Longrightarrow> primitive u \<Longrightarrow> primitive (f u)"
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