Several recent examples suggest a reminder of the requirement that senders use *text-only* for posts to the categories mailing list. Moreover, from today this requirement will be *strictly* enforced. At most one warning will be sent to a poster, and warnings already sent will not be repeated. Therefore, if a post you send does not appear in a reasonable time, you should assume that it has been discarded. You may resend your message, ensuring it is text. This note is an opportunity to quote another part of the list policy: "The subject of this mailing list is *category theory*. Items on another subject may be posted if judged by the moderator to be of interest to the list. Discussion of such posts is excluded." Thanks for your cooperation, Bob Rosebrugh [For admin and other information see: http://www.mta.ca/~cat-dist/ ]