English
Same relation as above, stated for general u and f with complement in a Boolean algebra.
Русский
Та же связь, что и выше, для произвольной u и f в булевой алгебре.
LaTeX
$$$(\\limsup u f) \\setminus a = \\liminf (\\lambda b. u b \\setminus a) f$$$
Lean4
theorem sdiff_liminf (a : α) : a \ liminf u f = limsup (fun b => a \ u b) f :=
by
rw [← compl_inj_iff]
simp only [sdiff_eq, limsup_compl, comp_def, compl_inf, compl_compl, sup_liminf]