Sequential topological groups of any sequential order under CH
Volume 155 / 1998
                    
                    
                        Fundamenta Mathematicae 155 (1998), 79-89                    
                                        
                        DOI: 10.4064/fm-155-1-79-89                    
                                    
                                                Abstract
For any $α < ω_1$ a countable sequential topological group of sequential order α is constructed using CH.
 
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            