fact: Definition scalable_for (R : ringType) (U : lmodType R) (V : zmodType) (s : R -> V -> V) (f : U -> V) := forall a, {morph f : u / a *: u >-> s a u}.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(choice fintype finfun bigop prime binomial)