Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-02-05 15:46 bd38c5ff

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chore(linear_algebra): move is_basis_std_basis to std_basis.lean (#6054) This is a follow-up to #6020 which moved std_basis to a new file: now move results from basis.lean to that same file. CC @eric-wieser

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