fact: Definition seq_eqNai s := forall k, k < seq.size s -> I.convert (seq.nth I.zero s k) = Inan.
imports: Coq(ZArith Reals) Coquelicot(Coquelicot) mathcomp.ssreflect(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype bigop) Flocq(Core) Stdlib MathComp Interval Xreal Basic_rec