Category Archives: category theory

Monoidal centres

I was chatting to Craig “Cap. Astro” Pastro yesterday evening over a beer, and he mentioned an interesting question: if you take the monoidal centre of a braided monoidal category, do you get back the thing you started with? We … Continue reading

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More on strictification

Another fascinating day! At lunch time Steve Lack told me some interesting things about the strictification operator for bicategories. Apparently section 5.6 of [GPS] is wrong, and Steve reckons Gray is probably not triequivalent to Bicat. (The mistake in 5.6 … Continue reading

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Calgary 2

I’m in Calgary now, at the CMS meeting. This morning’s session was very interesting, but so far I’ve learnt more from chatting with the other participants. The Sydneyites tell me that Ross Street thinks he has found a good way … Continue reading

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On semi-strictness

Update: One correction and one addition; changes in red. Second update: another correction. I had a couple of very interesting responses to my speculation about n-categories. As well as John Baez’s comment, I had an email from Tom Leinster pointing … Continue reading

Posted in category theory, speculation | 2 Comments

Calgary

Next week I’m off to Calgary, where I’m giving a talk at the category theory session of the Canadian Mathematical Society’s summer meeting, and then a (completely different) talk at FMCS. I’m not too worried about the FMCS talk, because … Continue reading

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Speculating about n-categories

According to the stats I’ve already had one reader, so perhaps it’s time for me to stick my neck out: this speculation tag is intended for things that might be utter nonsense, a fair proportion of which I shall no … Continue reading

Posted in category theory, speculation | 5 Comments