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Commit 2019-02-07 14:58 ad7ef864

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refactor(set_theory/cardinal): split up mk_Union_le_mk_sigma, add mk_Union_eq_mk_sigma; add equiv congruence for subtype

Estimated changes

Modified src/data/equiv/basic.lean

added def equiv.set_congr

added def equiv.subtype_congr

Modified src/data/set/lattice.lean

added theorem set.bijective_sigma_to_Union

added theorem set.injective_sigma_to_Union

added def set.sigma_to_Union

added theorem set.surjective_sigma_to_Union

Modified src/set_theory/cardinal.lean

added theorem cardinal.mk_Union_eq_sum_mk

modified theorem cardinal.mk_eq_of_injective