fact: Definition OuPex (f : A -> R * R -> R^o) (g : R * R -> R^o) := exists2 alp, 0 < alp & exists2 C, 0 < C & forall X, forall dX : normedR2, `|dX| < alp -> P dX -> `|f X dX| <= C * `|g dX|.
imports: Reals Coq(ssreflect ssrfun ssrbool) mathcomp(ssrnat eqtype choice fintype bigop order ssralg ssrnum) mathcomp(boolp reals Rstruct ereal) mathcomp(classical_sets signed topology normedtype landau)