First erratum

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/ ]