English
There exists an algebraic structure on the subtype of elements in the center of a ring, compatible with the ambient ring structure.
Русский
Существует структура алгебры на подтипе элементов центра кольца, совместимая со структурой кольца.
LaTeX
$$Algebra (Subtype mem center R) R$$
Lean4
instance {R : Type*} [Ring R] : Algebra (Subring.center R) R
where
algebraMap :=
{ toFun := Subtype.val
map_one' := rfl
map_mul' _ _ := rfl
map_zero' := rfl
map_add' _ _ := rfl }
commutes' r x := (Subring.mem_center_iff.1 r.2 x).symm
smul_def' _ _ := rfl