fact: Definition max x y := match cmp x y with | Xlt => y | Xeq => y | Xgt => x | Xund => nan end.
imports: Coq(ZArith Reals Lia Bool Psatz) Flocq(Zaux Raux Digits Bracket) mathcomp.ssreflect(ssrbool) Xreal Basic Generic Generic_proof Sig Specific_sig