English
Uniform convergence on a product with a principal filter on a set is equivalent to standard uniform convergence on that set.
Русский
Сходимость по произведению с простым фильтром на множество эквивалентна обычной равномерной сходимости на этом множестве.
LaTeX
$$Tendsto ↿F (p ×ˢ 𝓟 s) (𝓝 c) ↔ TendstoUniformlyOn F (fun _ => c) p s$$
Lean4
/-- Uniform convergence on a set `s` to a constant function is equivalent to convergence in
`p ×ˢ 𝓟 s`. -/
theorem tendsto_prod_principal_iff {c : β} : Tendsto ↿F (p ×ˢ 𝓟 s) (𝓝 c) ↔ TendstoUniformlyOn F (fun _ => c) p s :=
by
rw [tendstoUniformlyOn_iff_tendstoUniformlyOnFilter]
exact tendsto_prod_filter_iff