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New tag suggestions:
"class-theory" for questions about foundations of set theory from the point of view of the various class-theoretical extensions of axiomatic set theory (Morse-Kelley, NBG, ZF, etc.)
"errata-in-published-works" for questions about "Is this an error I see before me, the pages ...
Maybe it could be called book-errata?
I cannot give many examples of discussions from math.SE offhand but at least one example from here
https://math.stackexchange.com/questions/34641/find-limit-of-unknown-function
This is an example from a different forum:
http://www.sosmath.com/CBB/viewtopic....
No. Usually a better thing to do when finding a typo/error in a textbook is to notify the author and the publisher, so it could be corrected for the next printing. Some authors even maintain their own erratum on their own websites.
In addition: when a student comes here to ask a question, the l...
I disagree with Willie's answer. I found this post because I was going to make the same suggestion. We do get questions of the form "It says 'X' in this book, but that seems wrong and I think it should be 'Y'", and sometimes that turns out to be right -- here's one that I just answered Distinguis...
The set-theory tag is explicitly about mathematics (and metamathematics) in the context of $\mathsf{ZFC}$ and its subsystems and extensions.
Every now and then we see questions about other set theories ($\mathsf{NF}$ is popular enough, but there are other versions, see here, for instance).
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