English
In any complete lattice α, the limsSup of the top filter equals the top element: limsSup (⊤ : Filter α) = ⊤.
Русский
В любой полной решётке α лимсап верхнего фильтра равен верхнему элементу: limsSup (⊤ : Filter α) = ⊤.
LaTeX
$$$\\limsSup (\\top : Filter \\alpha) = \\top$$$
Lean4
@[simp]
theorem limsSup_top : limsSup (⊤ : Filter α) = ⊤ :=
top_unique <| le_sInf <| by simpa [eq_univ_iff_forall] using fun b hb => top_unique <| hb _