English
In any complete lattice α, the limsInf of the top filter equals the bottom element: limsInf (⊤ : Filter α) = ⊥.
Русский
В любой полной решётке α лиминф верхнего фильтра равен нижнему элементу: limsInf (⊤ : Filter α) = ⊥.
LaTeX
$$$\\operatorname{limsInf}(\\top) = \\bot$$$
Lean4
@[simp]
theorem limsInf_top : limsInf (⊤ : Filter α) = ⊥ :=
bot_unique <| sSup_le <| by simpa [eq_univ_iff_forall] using fun b hb => bot_unique <| hb _