Wed, 07 Dec 2022 12:38:06 +0100 wenzelm clarified signature;
Wed, 07 Dec 2022 10:11:58 +0100 desharna stated goals of some lemmas explicitely to prevent silent changes
Tue, 06 Dec 2022 18:56:28 +0100 desharna rewrite proofs using to_pred attribute on existing lemmas
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