fact: Definition itv_cond (i : interval int) (x : R) := x \in map_itv (fun x => x%:~R : R) i.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool) mathcomp(ssrnat eqtype choice order ssralg ssrnum ssrint) mathcomp(interval) mathcomp(mathcomp_extra boolp) signed