proposition: Lemma linearDr : {morph f z : x y / x + y}.
proof: Proof. exact: raddfD. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg fingroup zmodp poly ssrnum) mathcomp(matrix mxalgebra vector falgebra ssrnum algC algnum) mathcomp(fieldext) mathcomp(vector)