Counterexample on semiradial Banach algebras
Tom 46 / 1982
                    
                    
                        Colloquium Mathematicum 46 (1982), 79-83                    
                                        
                        DOI: 10.4064/cm-46-1-79-83                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            