Charles Wells (mathematician)

Charles Wells (born 1937) is an American mathematician known for his fundamental contributions to category theory. He is Professor Emeritus of Mathematics at Case Western Reserve University.
Wells taught there for about 35 years, with sabbatical interruptions at ETH Zürich (in mathematics) and Oxford University (in computing science). He has had a research career in mathematics in finite fields, group theory and category theory. In the last twenty years he has also been interested in the language of mathematics and related issues concerning teaching and communicating abstract ideas.
He currently lives in Minnesota.

Books

• Barr, Michael; Wells, Charles (1985), "Toposes, Triples and Theories" (PDF), Grundlehren der mathematischen Wissenschaften, Springer-Verlag, 278, ISBN 0-387-96115-1. 
• Michael Barr and Charles Wells: Category Theory for Computing Science (1999).
• Wells, Charles (2003), A Handbook of Mathematical Discourse, Infinity Publishing, ISBN 0-7414-1685-9. 

Selected research articles

• Polynomials over finite fields which commute with translations Proc. Amer. Math. Soc. 46 (1974), 347–350.

Surveys

• Sketches (1993) – a survey of the literature on sketches

• Pitts, A. (1991). Review of Toposes, Triples and Theories by Barr, M., & Wells, C., Journal of Symbolic Logic 56(1), 340–341.
• Rota, G. (1986). Toposes, Triples and Theories, Springer, 1985, 345 pp., Advances in Mathematics 61(2).