fact: Definition Csigma f low high := sum_f_C0 (fun n : nat => f (low + n)%nat) (high - low).
imports: Rsequence_def Rinterval Ranalysis_def Rsequence_cv_facts Rsequence_tactics MyRIneq Cfunctions Csequence Csequence_facts CFsequence Cnorm Cprop_base Ctacfield Lia Lra PeanoNat Cmet Canalysis_def Canalysis_deriv