Back in August, I did a bit of reading on category theory. I’m now taking that up again with a group of graduate students. We’ve started working through Robert Goldblatt’s Topoi: The Categorical Analysis of Logic (an amazing bargain reprint from Dover). And this time I’m getting more of a feel for what is going on. Or at least, I have the comforting illusion of understanding — but it could all be shattered soon, when it is my turn to talk at the reading group next week, supposedly helping us through chapters 5 and 6.

Up to about half-way through chapter 3, Goldblatt proceeds at a pretty gentle pace; he then accelerates a bit alarmingly. Reading his first three chapters in parallel with the first six chapters of Steve Awodey’s Category Theory works well, however, if you have the time.

And is the effort worth it? Well, we’ll see (though my sense so far is that the answer should be very positive). But in the meantime, we’re certainly having fun …