fact: Definition ringfun_module {R S : ring} (f : ringfun R S) : module R.
imports: UniMath.Algebra.Modules.Core UniMath.Algebra.Modules.Multimodules UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.RigsAndRings UniMath.Foundations.Preamble UniMath.MoreFoundations.Tactics