English
If a family tends uniformly on a set s, it also tends uniformly on any subset s' ⊆ s.
Русский
Если семейство сходится по равномерности на s, то аналогично на любом подмножестве s' ⊆ s.
LaTeX
$$$h : TendstoUniformlyOn F f p s \\quad \\text{and} \\quad s' \\subseteq s \\Rightarrow TendstoUniformlyOn F f p s'$$$
Lean4
theorem mono (h : TendstoUniformlyOn F f p s) (h' : s' ⊆ s) : TendstoUniformlyOn F f p s' :=
tendstoUniformlyOn_iff_tendstoUniformlyOnFilter.mpr
(h.tendstoUniformlyOnFilter.mono_right (le_principal_iff.mpr <| mem_principal.mpr h'))