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Commit 2021-03-01 21:31 cc579154

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chore(data/equiv/basic): add simp lemmas about subtype_equiv (#6479)

Estimated changes

Modified src/data/equiv/basic.lean

modified theorem equiv.cast_refl

added theorem equiv.subtype_equiv_refl

added theorem equiv.subtype_equiv_symm

deleted theorem equiv.subtype_equiv_symm_apply

added theorem equiv.subtype_equiv_trans