[Merged by Bors] - refactor(set_theory/cardinal): review API about #α = 2/nat.card α = 2
#16899
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This looks good to me. Please merge it once the dep PR is merged. bors d+ |
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…= 2` (#16899) * Rename `cardinal.mk_eq_nat_iff_finset` to `cardinal.mk_set_eq_nat_iff_finset`, add a version for types and `cardinal.mk_eq_nat_iff_fintype`. * Add `cardinal.to_nat_eq_iff`, a more general version of `cardinal.to_nat_eq_one`. * Rename `cardinal.exists_not_mem_of_length_le` to `cardinal.exists_not_mem_of_length_lt`. * Add `cardinal.mk_eq_two_iff`, `cardinal.mk_eq_two_iff'`, `nat.card_eq_two_iff`, and `nat.card_eq_two_iff'`.
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#α = 2/nat.card α = 2#α = 2/nat.card α = 2
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cardinal.mk_eq_nat_iff_finsettocardinal.mk_set_eq_nat_iff_finset, add a version for types andcardinal.mk_eq_nat_iff_fintype.cardinal.to_nat_eq_iff, a more general version ofcardinal.to_nat_eq_one.cardinal.exists_not_mem_of_length_letocardinal.exists_not_mem_of_length_lt.cardinal.mk_eq_two_iff,cardinal.mk_eq_two_iff',nat.card_eq_two_iff, andnat.card_eq_two_iff'.