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Commit 2022-06-04 21:21 f65b160d

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feat(set_theory/cardinal/cofinality): basic lemmas on limit cardinals (#14439)

Estimated changes

Modified src/set_theory/cardinal/cofinality.lean

added theorem cardinal.is_limit.ne_zero

added theorem cardinal.is_limit.succ_lt

added theorem cardinal.is_strong_limit.ne_zero

added theorem cardinal.is_strong_limit.two_power_lt