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Def derangements.derangements_option_equiv_sigma_at_most_one_fixed_point

Modification history

2021-09-08 08:23
src/combinatorics/derangements/basic.lean
feat(data/equiv/derangements/basic): define derangements (#7526) …
Added derangements.derangements_option_equiv_sigma_at_most_one_fixed_pointView on Github →