fact: Definition is_RInt (f : R -> V) (a b : R) (If : V) := filterlim (fun ptd => scal (sign (b-a)) (Riemann_sum f ptd)) (Riemann_fine a b) (locally If).
imports: Coq(Reals Psatz) mathcomp(ssreflect ssrbool ssrfun eqtype seq) Markov Rcomplements Rbar Lub Lim_seq SF_seq Continuity Hierarchy