books.google.co.uk - From a Geometrical Point of View explores historical and philosophical aspects of category theory, trying therewith to expose its significance in the mathematical landscape. The main thesis is that Klein s Erlangen program in geometry is in fact a particular instance of a general and broad phenomenon...http://books.google.co.uk/books/about/From_a_Geometrical_Point_of_View.html?id=bvy0aANuhPYC&q=de%EF%AC+nition&utm_source=gb-gplus-shareFrom a Geometrical Point of View
