English
Uniform convergence of F to a constant on a product of filters is equivalent to convergence of F to that constant function uniformly on the set.
Русский
Сходимость по произведению фильтров к константе эквивалентна равномерной сходимости к константной функции.
LaTeX
$$$\text{Tendsto } ↿F (p ×ˢ p') (𝓝 c) \iff \text{TendstoUniformlyOnFilter } F (\text{const}_c) p p'$$
Lean4
theorem prodMk {ι' β' : Type*} [UniformSpace β'] {F' : ι' → α → β'} {f' : α → β'} {p' : Filter ι'}
(h : TendstoUniformly F f p) (h' : TendstoUniformly F' f' p') :
TendstoUniformly (fun (i : ι × ι') a => (F i.1 a, F' i.2 a)) (fun a => (f a, f' a)) (p ×ˢ p') :=
(h.prodMap h').comp fun a => (a, a)