proposition: Lemma isapropislinear {R : ring} {M N : module R} (f : M -> N) : isaprop (islinear f).
proof: Proof. apply (impred 1 _). intro r. apply (impred 1 _). intro x. apply (setproperty N). Defined.
imports: UniMath.MoreFoundations.Tactics UniMath.Algebra.RigsAndRings UniMath.Algebra.Groups UniMath.Algebra.Monoids