Charles Wells (mathematician)
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Charles Wells Mathematician
Charles Wells (4 May 1937 in Atlanta, Georgia - 17 June 2017)  was an American mathematician known for his fundamental contributions to  category theory. He was 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 had a research career in mathematics in finite fields, group theory and category theory. In the last twenty years of this life he had also been interested in the language of mathematics and related issues concerning teaching and communicating abstract ideas.
He lived in
In addition to his scholarly publications, Wells produced
A Handbook of Mathematical Discourse,  which is a dictionary of words and concepts used by mathematicians that are easily misunderstood, explained in a way that laypersons can also appreciate. As a life-long  shape note singer, in 2002 Wells jointly compiled a tunebook called Oberlin Harmony, which included some of his own compositions.
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: (1999). Category Theory for Computing Science Wells, Charles (2003), , Infinity Publishing, A Handbook of Mathematical Discourse ISBN . 0-7414-1685-9
Selected research articles
^ Birth and Career Data from
American Men and Women of Science, Thomson Gale 2004
Home page at CWRU
^ Negative review:
Krantz, Steven G. (September 2004). "Book Review: A Handbook of Mathematical Discourse" (PDF). Notices of the AMS. 51 (8): 897-898.
^ Positive review:
Selden, Annie (February 27, 2014). "MAA Review: A Handbook of Mathematical Discourse". Mathematical Association of America Reviews.
^ Charles Wells, Chloe Maher,
Oberlin Harmony (2002, Oberlin, Ohio). Incomplete table of contents given in: "Oberlin Harmony". Hymnary.org . Retrieved 2020.
^ 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).