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Polynomial Operations

+: Poly x Poly -> Poly

(p+q)i := pi + qi

-: Poly x Poly -> Poly

(p-q)i := pi - qi

-: Poly -> Poly

(-p)i := -(pi)

*: Poly x Poly -> Poly

(p*q)i := (sum0 <= j <= i pj * qi-j)