Web Directory

» A Gentle Introduction to Category Theory
   Lecture notes by Maarten M. Fokkinga introducing some important notions from category theory, in particular adjunctions. Proofs are given in a calculational style, and the (few) examples are taken from algorithmics. The text is a long PostScript file.
   http://wwwhome.cs.utwente.nl/~fokkinga/mmf92b.html

» CT Category Theory
   Section of the e-print arXiv dealing with category theory, including such topics as: enriched categories, topoi, abelian categories, monoidal categories, homological algebra.
   http://front.math.ucdavis.edu/math.CT

» Categorical Myths and Legends
   An archive of stories about category theorists.
   http://www.mcs.le.ac.uk/~ah83/cat-myths/

» Categories Home Page
   Web page for the category theory mailing list.
   http://www.mta.ca/~cat-dist/

» Categories, Quantization, and Much More
   Introductory article by John Baez.
   http://math.ucr.edu/home/baez/categories.html

» Category Theory
   This expository article is an entry in the Stanford Encyclopedia of Philosophy.
   http://plato.stanford.edu/entries/category-theory/

» Category Theory and Homological Algebra
   In the "known maths" series.
   http://www.math.niu.edu/~rusin/known-math/index/18-XX.html

» Computational Category Theory
   An implementation of concepts and constructions from category theory in the functional programming language Standard ML. Documentation and code.
   http://www.cs.man.ac.uk/~david/categories/

» Descent and Category Theory Connections
   Maintained by M. Alsani.
   http://north.ecc.edu/alsani/descent.html

» Groupoid Home Page
   Maintained by Birant Ramazan. Address book, open problems, meetings, pictures, other resources.
   http://unr.edu/homepage/ramazan/groupoid/

» Groupoids
   Notes by Ronald Brown.
   http://www.bangor.ac.uk/~mas010/gpds.htm

» Open Problems on Model Categories
   Problems on model categories listed by Mark Hovey at Wesleyan University.
   http://claude.math.wesleyan.edu/~mhovey/problems/model.html

» Paul Taylor's Home Page
   Includes papers on category theory.
   http://www.cs.man.ac.uk/~pt/

» Toposes, Triples and Theories
   By Michael Barr and Charles Wells, 1983. A revised and corrected version is now available free for downloading. Formats: DVI, PDF, PostScript.
   http://www.case.edu/artsci/math/wells/pub/ttt.html