fact: Definition mul_tail n p q := mkseq (fun i => mul_coeff p q (n.+1+i)) ((size p + size q).-1 - n.+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