English
For any S ⊆ A, the range of the valuation map S.val is S.
Русский
Для любой подгруппы S ⊆ A образ отображения S.val есть S.
LaTeX
$$$\text{range}(S.\mathrm{val}) = S$$$
Lean4
/-- The map `S → T` when `S` is a subalgebra contained in the subalgebra `T`.
This is the subalgebra version of `Submodule.inclusion`, or `Subring.inclusion` -/
def inclusion {S T : Subalgebra R A} (h : S ≤ T) : S →ₐ[R] T
where
toFun := Set.inclusion h
map_one' := rfl
map_add' _ _ := rfl
map_mul' _ _ := rfl
map_zero' := rfl
commutes' _ := rfl