fact: Fixpoint sum_f_R0 (f:nat -> R) (N:nat) : R := match N with | O => f 0%nat | S i => sum_f_R0 f i + f (S i) end.
imports: ArithRing Rdefinitions Raxioms RIneq Rpow_def R_Ifp Rbasic_fun R_sqr SplitAbsolu SplitRmult ArithProp Zpower Ztac