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May 31, 2021 at 22:07 answer added Tom Leinster timeline score: 2
May 23, 2021 at 12:38 history edited Tom Leinster CC BY-SA 4.0
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May 23, 2021 at 12:32 comment added Tom Leinster @MartinBrandenburg Yes, absolutely!
May 23, 2021 at 12:30 comment added Martin Brandenburg Tom, are you also interested in non-original, but still old references?
May 23, 2021 at 11:46 comment added Paul Taylor Who firrst wrote down the symmetrical "triangle laws" for the unit and counit? Daniel Kan? They would either have commented on these equivalent categories or considered the point too trivial to mention. Either way, if you have to give such a citation, this would be it.
May 23, 2021 at 11:40 comment added Tom Leinster Thanks for the flattery, Paul :-) My reason is very boring: a referee has asked if I could add a citation for the construction, so I would like to add one. As for previous questions, I see now that there was one on MSE back in 2013 asking something similar but not quite identical; they wanted an extensive treatment rather than the first treatment/mention (math.stackexchange.com/questions/562947/…). But no one answered.
May 23, 2021 at 11:33 comment added Paul Taylor I think we had a question about this before. Of course the subcategories $A'$ and $B'$ are likely to be empty. Someone of your eminence must have some deeper reason for asking about this: please let on.
May 23, 2021 at 11:26 history asked Tom Leinster CC BY-SA 4.0