src/HOL/Combinatorics/Perm.thy
Sun, 09 May 2021 05:48:50 +0000 haftmann more elementary swap
Wed, 05 May 2021 16:09:02 +0000 haftmann tuned theory structure
Wed, 05 May 2021 16:09:02 +0000 haftmann more appropriate location
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