src/HOL/ex/Peano_Axioms.thy
Tue, 22 Oct 2019 11:14:52 +0200 wenzelm clarified types (again): 'a is canonical for 'class' (as alternative to 'locale'), 'b is common for Hindley-Milner examples;
Wed, 18 Jan 2017 17:56:52 +0100 wenzelm clarified theory name;
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