English
There is a natural R-algebra structure on MvPowerSeries σ A, arising from the algebra structure on A and the coefficientwise map.
Русский
Существует естественная структура R-алгебры на MvPowerSeries σ A, возникающая из алгебраической структуры A и коэффициентного отображения.
LaTeX
$$$\\text{MvPowerSeries}(\\sigma, A) \\text{ is an } R\\text{-algebra}$$$
Lean4
instance : Algebra R (MvPowerSeries σ A)
where
algebraMap := (MvPowerSeries.map (algebraMap R A)).comp C
commutes' := fun a φ => by
ext n
simp [Algebra.commutes]
smul_def' := fun a σ => by
ext n
simp [(coeff A n).map_smul_of_tower a, Algebra.smul_def]