∀[X:Type]. ∀[r:CRng]. ∀[a:PowerSeries(X;r)]. (((a+0) = a ∈ PowerSeries(X;r)) ∧ ((0+a) = a ∈ PowerSeries(X;r)))
{ xxxAutoxxx }
1. X : Type
2. r : CRng
3. a : PowerSeries(X;r)
⊢ (a+0) = a ∈ PowerSeries(X;r)