Case Western Reserve University main page


Professor Emeritus of Mathematics
Case Western Reserve University

charles (at)


My Research

Since the mid-seventies, my research interests have been in category theory and its connections with theoretical computer science, in mathematical discourse, and in the problems of teaching and understanding mathematics.

Class Notes


         Abstract Math, a website based on the Handbook for anyone beginning to learn about some aspect of abstract math. 

         Astounding Math Stories

         Gyre & Gimble, a blog about math and language

         My TeX macros

         Personal Website