4: Number Theoretic Functions Last updated Jul 7, 2021 Save as PDF 3.6 Exercises 4.1: Multiplicative Functions Page ID60313 J. J. P. VeermanPortland State University via PDXOpen: Open Educational Resources ( \newcommand{\kernel}{\mathrm{null}\,}\) 4.1: Multiplicative Functions4.2: Additive Functions4.3: Mobius inversion4.4: Euler’s Phi or Totient Function4.5: Dirichlet and Lambert Series4.6: Exercise