English
Pointwise minimum of two antitone functions is antitone.
Русский
Пусть две антитонные функции; их точечная минимальная функция антотонна.
LaTeX
$$$ [Preorder α] [LinearOrder β] {f g : α → β} (hf : Antitone f) (hg : Antitone g) : Antitone (fun x => min (f x) (g x))$$$
Lean4
/-- Pointwise minimum of two monotone functions is a monotone function. -/
protected theorem min [Preorder α] [LinearOrder β] {f g : α → β} (hf : Antitone f) (hg : Antitone g) :
Antitone fun x => min (f x) (g x) :=
hf.inf hg