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Commit 2020-08-25 14:36 b03ce616

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chore(set_theory/game): various cleanup and code golf (#3939)

Estimated changes

Modified src/set_theory/game/impartial.lean

added theorem pgame.impartial_not_first_loses

added theorem pgame.impartial_not_first_wins

Modified src/set_theory/game/nim.lean

modified theorem nim.nim_def

modified theorem nim.nim_zero_first_loses

Modified src/set_theory/game/winner.lean

added theorem pgame.not_first_loses_of_first_wins

added theorem pgame.not_first_wins_of_first_loses