Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-02-20 01:44 32b9b214

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refactor(linear_algebra/pi): add linear_map.single to match add_monoid_hom.single (#6315) This changes the definition of std_basis to be exactly linear_map.single, but proves equality with the old definition. In future, it might make sense to remove std_basis entirely.

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