English
If β has a star operation, then ZeroAtInftyContinuousMap α β inherits a star-ring/StarAddMonoid structure in a pointwise fashion.
Русский
Если у β есть звездная операция, то ZeroAtInftyContinuousMap α β наследует звездную кольцевую/StarAddMonoid структуру по точкам.
LaTeX
$$Star(ZeroAtInftyContinuousMap α β)$$
Lean4
instance instStar : Star C₀(α, β) where
star
f :=
{ toFun := fun x => star (f x)
continuous_toFun := (map_continuous f).star
zero_at_infty' := by simpa only [star_zero] using (continuous_star.tendsto (0 : β)).comp (zero_at_infty f) }