fact: Definition mul_coeff (p q : T) (k : nat) : C.T := foldl (fun x i => C.add u (C.mul u (nth p i) (nth q (k - i))) x) (C.zero) (rev (iota 0 k.+1)).
imports: Coq(ZArith Reals) Coquelicot(Coquelicot) mathcomp.ssreflect(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype bigop) Flocq(Core) Stdlib MathComp Interval Xreal Basic_rec