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Commit 2021-07-22 21:19 0cbc6f39

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feat(linear_algebra/matrix/determinant): generalize det_fin_zero to det_eq_one_of_is_empty (#8387) Also golfs a nearby proof

Estimated changes

Modified src/data/equiv/basic.lean

Modified src/data/fintype/basic.lean

added theorem fintype.card_eq_one_iff_nonempty_unique

modified theorem fintype.univ_of_is_empty

added theorem univ_is_empty

Modified src/linear_algebra/matrix/determinant.lean

deleted theorem matrix.det_fin_zero

added theorem matrix.det_is_empty