I’m slowly working on a corrected update of Introducing Category Theory, perhaps for early in the new year. But you can today download a new PDF version, without any of the revised content, but now with the bookmarks for chapters and sections usefully giving numbers as well as headings.

Heaven knows why that isn’t the hyperref package default. As someone very sensibly pointed out, having the PDF sidebar bookmarks numbered surely makes navigation easier — and one line of code does the trick.

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