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