fact: Definition γ_sum α {R : ring α} {K : field R} {acf : algeb_closed_field K} b n f L := let qr := Q_ring in Σ (i = 0, n), nth_γ (b + i) f L.
imports: Utf8 QArith NPeano Sorting Misc Field2 Fpolynomial Fsummation Newton ConvexHull Power_series Puiseux_series Ps_add Ps_mul Ps_div PSpolynomial Puiseux_base AlgCloCharPol CharactPolyn F1Eq F1Prop Q_field PosOrder QbarM