Generalized fractional linear transformations: convexity and compactness of the image and the pre-image; applications.
Volume 137 / 1999
                    
                    
                        Studia Mathematica 137 (1999), 169-175                    
                                        
                        DOI: 10.4064/sm-137-2-169-175                    
                                    
                                                Abstract
The convexity and compactness in the weak operator topology of the image and pre-image of a generalized fractional linear transformation is established. As an application the exponential dichotomy of solutions to evolution problems of the parabolic type is proved.
 
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            