Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-10-26 07:25 717de02d

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refactor(linear_algebra/free_module/pid): move lemmas (#9962) linear_algebra/free_module/pid contains several results not directly related to PID. We move them in more appropriate files. Except for small golfing and easy generalization, the statements and the proofs are untouched.

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