Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-04-17 02:40 89c16a79

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chore(ring_theory/adjoin.basic): use submodule.closure in algebra.adjoin_eq_span (#7194) algebra.adjoin_eq_span uses monoid.closure that is deprecated. We modify it to use submonoid.closure.

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