fact: Definition neq_creal (x y : creal) : Prop := exists eps, (0 < eps) && (eps * 3%:R <= `|x (cauchymod x eps) - y (cauchymod y eps)|).
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop order ssralg ssrnum ssrint rat poly polydiv polyorder) mathcomp(perm matrix mxpoly polyXY binomial bigenough)