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Commit 2022-04-10 23:04 609eb59e

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feat(set_theory/cofinality): Every ordinal has a fundamental sequence (#12317)

Estimated changes

Modified src/set_theory/cofinality.lean

modified theorem ordinal.cof_cof

added theorem ordinal.exists_fundamental_sequence

added theorem ordinal.is_fundamental_sequence.blsub_eq

added theorem ordinal.is_fundamental_sequence.cof_eq

added theorem ordinal.is_fundamental_sequence.monotone

added theorem ordinal.is_fundamental_sequence.strict_mono

added theorem ordinal.is_fundamental_sequence.trans

added def ordinal.is_fundamental_sequence