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Theorem
ordinal.left_eq_zero_of_add_eq_zero
Modification history
2022-03-10 09:02
src/set_theory/ordinal_arithmetic.lean
feat(set_theory/ordinal_arithmetic): `add_eq_zero_iff`, `mul_eq_zero_iff` (#12561)
Added
ordinal.left_eq_zero_of_add_eq_zero
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