:<math>\mathcal{D}(f * g) = \mathcal{D}f * g = f * \mathcal{D}g \,</math>,
, met <math>\mathcal{D''}f''</math> de [[afgeleide]] van ''<math>f''</math> (continu geval) ofen <math>(\mathcal{D''}f'')(''n'')= ''f''(''n''+1)- ''f''(''n'')</math> (discreet geval)
