English
In a Boolean algebra, for Finset s and function f, the infimum of f b ⇨ a over b in s equals the implication of the supremum of f with a: (s.inf (fun b => f b ⇨ a)) = (s.sup f) ⇨ a.
Русский
В булевой алгебре для Finset s и функции f справедливо равенство: inf b∈s (f b ⇨ a) = (sup b∈s f b) ⇨ a.
LaTeX
$$Eq (s.inf (fun b => inst.himp (f b) a)) (inst.himp (s.sup f) a)$$
Lean4
theorem inf_himp_right (s : Finset ι) (f : ι → α) (a : α) : (s.inf fun b => f b ⇨ a) = s.sup f ⇨ a :=
@sup_sdiff_left αᵒᵈ _ _ _ _ _