George Janelidze just wrote to tell me that the definition of equivalence of categories is wrong. Yes, and it is wrong in the original too. The corrected version, with a new footnote is in the latest version, just posted. George further requested that I maintain a list of errata so if you find an error you can refer to that list before sending it to me. Instead, since I will post a new version whenever I get and correct an error, please just check your errors against the latest version. I don't know how many times, I read G's definition of categorical equivalence, not realzing that it was insufficient. Michael [For admin and other information see: http://www.mta.ca/~cat-dist/ ]