feat: add List.perm_ext_iff_of_nodup#14211
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A similar lemma is also proven in #11363 |
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This PR adds
List.perm_ext_iff_of_nodup: two duplicate-free lists are permutations of each other if and only if they have the same elements. This is currently only available in Batteries (where it is proved viaSubperm); here it is proved directly fromperm_iff_count.