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Commit 2022-05-04 07:50 d0efe252

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feat(data/finset/prod): diag of union (#13916) Lemmas about diag and off diag in relation to simple finset constructions.

Estimated changes

added theorem finset.diag_insert
added theorem finset.diag_singleton
added theorem finset.diag_union
added theorem finset.off_diag_insert
added theorem finset.off_diag_union