Which known writer was a mathematician?            
            
            
                                            
                
                
                
                
                    John Ronald Reuel Tolkien
                    
                                        
                    2799
                    
                    
                                             
               
                                                                                   
            Lewis Caroll, author of "Alice in Wonderland" completed his mathematical studies at Oxford University, was a lecturer at this University. He wrote about 250 scientific papers in mathematics, logic and cryptography. He was interested in mathematical puzzles and numerical games.