English
The neighborhood at a for the infimum topology iInf t is the infimum over i of the neighborhoods in t(i).
Русский
Окрестность в a для топологии iInf t равна наименьшему общему окрестностям по всем t(i).
LaTeX
$$theorem nhds_iInf {ι : Sort*} {t : ι → TopologicalSpace α} {a : α} : @nhds α (iInf t) a = ⨅ i, @nhds α (t i) a$$
Lean4
theorem nhds_iInf {ι : Sort*} {t : ι → TopologicalSpace α} {a : α} : @nhds α (iInf t) a = ⨅ i, @nhds α (t i) a :=
(gc_nhds a).u_iInf