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Bbb
6:00 PM
Super basic Calculus question: how does one recover a derivative from a coderivative (in the sense of HA 6.3.0.15)? HA doesn’t seem to explain this, but I might be missing something basic
 
Bbb
6:13 PM
Okay I found theorem 4 in McCarthy’s paper on dual calculus, which provides a necessary condition for derivative and coderivative to coincide, when the target is spectra. Is there anything more that is known about this comparison? There’s always a map one way...
 
 
5 hours later…
11:08 PM
Anyone have recs for a very introductory category theory textbook? Something suitable for undergrads who have maybe had a course in topology, some introductory stuff about things like the fundamental group, and an introductory course in abstract algebra?
 

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