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One of my goals with participating in this category theory course (other than the obvious) is to improve my writing, particularly my mathematical writing.
Earlier today How to Write Mathematics, Halmos was posted on Hacker News. It's 22 pages, but fairly easy to read and contains a good bit of guidance. Much of it is "obvious" as the author points out in the preface, but sometimes what's obvious isn't well understood or connected in our minds.
For those who, like me, haven't been writing a lot of math over the years this could be a useful or at least informative read. Since, based off the introductions, many of us are not professional mathematicians, and even fewer are mathematicians by education, this may be helpful.
I'm sure John Baez and others can offer additional advice or pointers to other resources similar to this one (or even counterpoints to some of Halmos' statements).