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Commit 2021-03-03 10:36 9c48eb18

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chore(ring_theory/{subring,integral_closure}): simplify a proof, remove redundant instances (#6513)

Estimated changes

Modified src/field_theory/subfield.lean

Modified src/ring_theory/integral_closure.lean

Modified src/ring_theory/subring.lean

deleted def subring.subset_comm_ring