| Issue 1 | _ | 
            
              | Front matter 
                  
                  
                 | _ | 
            
              | Article: A unifying framework for generalizations of the Eneström-Kakeya theorem 
                  
                  
                 | 1 | 
            
              | Article: Logical equivalence of the fundamental theorems on operators between Banach spaces 
                  
                  
                 | 15 | 
            
              | Article: Mittelwerte als Minima 
                  
                  
                 | 23 | 
            
              | Article: Inequalities of Levin-Strečkin, Clausing and Chebyshev revisited 
                  
                  
                 | 32 | 
            
              | Rubric: Aufgaben 
                  
                  
                 | 37 | 
            
              | Book review: Rezensionen 
                  
                  
                 | 44 | 
            
              | Back matter 
                  
                  
                 | _ | 
            
              | Issue 2 | _ | 
            
              | Front matter 
                  
                  
                 | _ | 
            
              | Article: Constructions of isospectral circulant graphs 
                  
                  
                 | 45 | 
            
              | Article: Drittes Hilbertsches Problem mit Dehn-Invariante : eine Elementarisierung mit Kugeldreiecken 
                  
                  
                 | 58 | 
            
              | Article: Mean value theorems and convexity : an example of cross-fertilization of two mathematical items 
                  
                  
                 | 69 | 
            
              | Article: A simple proof of the infinitude of primes 
                  
                  
                 | 80 | 
            
              | Rubric: Aufgaben 
                  
                  
                 | 81 | 
            
              | Back matter 
                  
                  
                 | _ | 
            
              | Issue 3 | _ | 
            
              | Front matter 
                  
                  
                 | _ | 
            
              | Article: Ratios, roots and means : a quartet of convergence tests 
                  
                  
                 | 89 | 
            
              | Article: Characteristics of modulo one sequences 
                  
                  
                 | 103 | 
            
              | Article: An application of Euclidian algorithm in cryptanalysis of RSA 
                  
                  
                 | 114 | 
            
              | Article: Mixtilinear radii and Finsler-Hadwiger inequality 
                  
                  
                 | 121 | 
            
              | Article: A proof of the Schwarz theorem on mixed partial derivatives via elementary approximation theory 
                  
                  
                 | 125 | 
            
              | Rubric: Aufgaben 
                  
                  
                 | 129 | 
            
              | Book review: Rezensionen 
                  
                  
                 | 135 | 
            
              | Back matter 
                  
                  
                 | _ | 
            
              | Issue 4 | _ | 
            
              | Front matter 
                  
                  
                 | _ | 
            
              | Article: Begegnung zwischen klassischen Mittelwerten und Kegelschnitten 
                  
                  
                 | 137 | 
            
              | Article: The irrationality measure of π as seen through the eyes of cos(n) 
                  
                  
                 | 152 | 
            
              | Article: An inequality for cevians and applications 
                  
                  
                 | 166 | 
            
              | Article: On the inequalities of Grüss-Čebyshev and Kantorovich : a probabilistic approach 
                  
                  
                 | 172 | 
            
              | Rubric: Aufgaben 
                  
                  
                 | 176 | 
            
              | Book review: Rezensionen 
                  
                  
                 | 180 | 
            
              | Table of Contents 
                  
                  
                 | 183 | 
            
              | Back matter 
                  
                  
                 | 187 |