fact: Definition opp_itv_subdef (i : interval int) : interval int := let 'Interval l u := i in Interval (opp_itv_bound_subdef u) (opp_itv_bound_subdef l).
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool) mathcomp(ssrnat eqtype choice order ssralg ssrnum ssrint) mathcomp(interval) mathcomp(mathcomp_extra boolp) signed