English
The quotient lift of f along h evaluated at the coe of x is f(x) when x is a list.
Русский
Подъем по активной эквивалентности через h для x, представляющего список, равен f(x).
LaTeX
$$$$Quotient.lift f h (x : Multiset\ α) = f x$$$$
Lean4
@[simp]
theorem lift_coe {α β : Type*} (x : List α) (f : List α → β) (h : ∀ a b : List α, a ≈ b → f a = f b) :
Quotient.lift f h (x : Multiset α) = f x :=
Quotient.lift_mk _ _ _