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Commit 2022-05-04 15:53 46023701

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feat(set_theory/game/birthday): More basic lemmas on birthdays (#13729)

Estimated changes

Modified src/set_theory/game/birthday.lean

added theorem pgame.birthday_add_zero

added theorem pgame.birthday_one

added theorem pgame.birthday_zero_add

Modified src/set_theory/game/pgame.lean

added theorem pgame.nat_one