Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-04-28 19:37 abf1c205

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feat(linear_algebra/free_module): free of finite torsion free (#7381) This is a reformulation of module.free_of_finite_type_torsion_free in terms of ring_theory.finiteness (combining my recent algebra PRs). Note this adds an import but it seems ok to me.

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