Dear all, My introductory textbook "Basic Category Theory" was published by Cambridge University Press in 2014. By arrangement with them, it's now also free online: https://arxiv.org/abs/1612.09375 It's also freely *editable*, under a Creative Commons licence. For instance, if you want to teach a class from it but some of the examples aren't suitable, you can delete them or add your own. Or if you don't like the notation (and when have two category theorists ever agreed on that?), you can easily change the Latex macros. Just go the arXiv, download, and edit to your heart's content. There are lots of good introductions to category theory out there. The particular features of this one are: * It's short. * It doesn't assume much. * It sticks to the basics. Best wishes, Tom -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]