English
The lift evaluated at the quotient representative equals the original map's value on the representative; i.e., c.lift f H (toQuotient x) = f x.
Русский
Лифтированное отображение на представителе квадрирования равно значению исходного отображения на этом представителе.
LaTeX
$$$c.lift f H (toQuotient x) = f x$$$
Lean4
/-- The diagram describing the universal property for quotients of monoids commutes. -/
@[to_additive (attr := simp) /-- The diagram describing the universal property for quotients of
`AddMonoid`s commutes. -/
]
theorem lift_coe (H : c ≤ ker f) (x : M) : c.lift f H x = f x :=
rfl