Updates: Categories and PHQ

I am busily proof-reading the category theory notes for typos and thinkos and expositional stumbles (while thinking how to much improve the final chapter). I’ve now reviewed the first 25 chapters, i.e. up to the first Interlude, and you’ll find today’s version online linked on the categories page. So far, discovered no disasters (though a missing line in a proof gave me pause), and I have made only minor changes.

I posted a link to a video of a Pavel Haas Quartet concert a few weeks ago. But that video is no longer available. So, to make up for that, here’s another, of their performance of Smetana’s first Quartet at the launch of the new season at Wigmore Hall. It is wonderful to see how happily they seem to have come together again with their new violist after their tribulations in that position: long may that last.

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