English
The Submodule underlying the infimum of a set S of Subalgebras equals the infimum of the images under toSubmodule: Subalgebra.toSubmodule(sInf S) = sInf (Subalgebra.toSubmodule '' S).
Русский
Подмодульная часть пересечения подпалгебр равна нижнему пределу образов подмодуля через toSubmodule: Subalgebra.toSubmodule(sInf S) = sInf (toSubmodule '' S).
LaTeX
$$$\operatorname{toSubmodule}(sInf S) = sInf(\operatorname{toSubmodule}''S)$$$
Lean4
@[simp]
theorem sInf_toSubmodule (S : Set (Subalgebra R A)) :
Subalgebra.toSubmodule (sInf S) = sInf (Subalgebra.toSubmodule '' S) :=
SetLike.coe_injective <| by simp