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Commit 2023-01-20 21:58 2d3f0c84

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feat(linear_algebra/dual): lemmas (#18228) some lemmas

Estimated changes

Modified src/linear_algebra/dual.lean

added theorem linear_map.dual_map_bijective_iff

added theorem linear_map.dual_map_injective_iff

added theorem linear_map.dual_map_injective_of_surjective

added theorem linear_map.dual_map_surjective_iff