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Commit 2022-04-24 02:22 92ca1369

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feat(set_theory/game/pgame): Birthdays of pre-games (#13636)

Estimated changes

Created src/set_theory/game/birthday.lean

added theorem pgame.birthday_def

added theorem pgame.birthday_move_left_lt

added theorem pgame.birthday_move_right_lt

added theorem pgame.birthday_zero

added theorem pgame.lt_birthday_iff

added theorem pgame.relabelling.birthday_congr