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Commit 2021-04-06 18:32 ae6d77ba

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feat(linear_algebra/free_module): a set of linearly independent vectors over a ring S is also linearly independent over a subring R of S (#6993) Zulip: https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there.20code.20for.20X.3F/topic/.60algebra_map.2Einjective.2Elinear_independent.60

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