fact: Definition fsfun_of_can_ffun (T : {fset K}) (g : {ffun T -> V}) (can_g : forall k : T, g k != default (val k)) := @Fsfun K V default (FinMap g) (appP forallP idP can_g).
imports: HB(structures) mathcomp(ssreflect ssrbool ssrnat eqtype ssrfun seq) mathcomp(choice path finset finfun fintype bigop)