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8:52 AM
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A: Tag management 2022

Prime MoverNew 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 ...

 
A previous discussion related to the second bullet point: Would a new tag for mistakes/typos/errata for books be useful/appropriate? NBG and MK were briefly discussed in the comments here: Tag for alternative set theories?Martin Sleziak 10 mins ago
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Q: Would a new tag for mistakes/typos/errata for books be useful/appropriate?

Martin SleziakMaybe 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....

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A: Would a new tag for mistakes/typos/errata for books be useful/appropriate?

Willie WongNo. 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...

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A: Would a new tag for mistakes/typos/errata for books be useful/appropriate?

jorikiI 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...

May 17, 2017 at 3:50, by Martin Sleziak
It seems that tag has been created recently, the tag-creator provided even the tag-wiki.
Posts where the tag was added/removed (including the editors): data.stackexchange.com/math/query/1105163/… data.stackexchange.com/math/query/1038474/…
Mar 25, 2013 at 19:46, by Martin Sleziak
The tag was created in this question. There was a new question about classes, and since the tag already existed, I've added it.
At the moment, no deleted questions with : data.stackexchange.com/math/query/883845/…
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Q: Tag for alternative set theories?

Andrés E. CaicedoThe 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). ...

I would say that Von Neumann–Bernays–Gödel set theory (NBG) is very similar to ZFC. If the proposed tag for alternative set theories is created, would NBG belong under this new tag? — Martin Sleziak Apr 22, 2018 at 16:32
@Martin I think theories like NBG, Morse-Kelley (MK), or Kripke-Platek (KP) are natural variants, extensions, or subsystems of ZFC. The situation with NFU is a bit curious in that significant work in the area has taken place by actually working in ZFC (with large cardinals) and then translating. — Andrés E. Caicedo Apr 22, 2018 at 17:20
 
9:17 AM
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Q: Suggested tag: errata in published works

Prime MoverThere are a number of questions (I've raised a few myself) about a source work which appears to have a mistake. One possibly useful function of MSE might be to assemble a repository of errata in published works based on such questions. Worth at this stage adding a tag for "errata"?

 

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