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Commit 2020-03-14 04:10 3d621b5e

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refactor(ring_theory/subring): use bundled homs (#2144)

Estimated changes

Modified src/field_theory/subfield.lean

Modified src/ring_theory/integral_closure.lean

Modified src/ring_theory/subring.lean

added theorem is_subring.coe_subtype

added def is_subring.subtype

modified theorem ring.image_closure