proposition: Lemma intrEsign x : x \is a int_num -> x = (-1) ^+ (x < 0)%R * `|x|.
proof: Proof. by move/Rreal_int/realEsign. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg poly ssrnum ssrint)