Charles Wells is Professor Emeritus of Mathematics at Case Western Reserve University; his research interest has been in group theory, category theory and its connections with theoretical computer science, in mathematical discourse, and in the problems of teaching and understanding mathematics.
Exposition of sheaf toposes:
On topos theory, monads (“triples”) and algebraic theories via sketches:
On category theory:
On sketches:
Last revised on November 7, 2023 at 07:30:51. See the history of this page for a list of all contributions to it.