Strongly continuous integrated C-cosine operator functions
Volume 126 / 1997
                    
                    
                        Studia Mathematica 126 (1997), 273-289                    
                                        
                        DOI: 10.4064/sm-126-3-273-289                    
                                    
                                                Abstract
We extend some recent results for regularized semigroups to strongly continuous n-times integrated C-cosine operator functions. Several equivalent conditions for the existence and uniqueness of solutions of (ACP$_2$) are also presented.
 
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            