It would probably be good to get some sort of consensus on tagging style (pr.probability-theory vs plain probability-theory.) I'm not sure if strict tags can / should be used and enforced on a site more visible to the public.
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$\begingroup$ I don't know that much about the MathOverflow tagging system, but the specific example you giveis not at all an issue, thanks to the tag autocomplete. $\endgroup$– Larry WangCommented Jul 21, 2010 at 5:29
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$\begingroup$ The posts on Meta MathOverflow explaining their tagging scheme: Why are MO tags formatted as they are? and What are top level tags, and why should I try to use them? $\endgroup$– Martin SleziakCommented Dec 30, 2018 at 17:26
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3 Answers
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So for MO the prefixes are very useful because we're used to that system for the ArXiv and we know that it does a good job of top level tagging. However, it's not at all clear to me that they're useful for this site. In particular, users of this site won't typically know what those prefixes mean, and there's no reason to expect that they do a good job partitioning elementary math questions. On the other hand it might be convenient to have some similarity in tagging between MO and here so that if and when questions can be migrated directly between them we won't have to do lots of retagging...
answered Jul 21, 2010 at 5:16
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3$\begingroup$ I'd like for there to be a lot of mobility between MO and MU. That way, we can send MU our elementary questions and MU can send us their questions that belong on MO. $\endgroup$– 97832123Commented Jul 21, 2010 at 5:22
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As Noah pointed out, MO tags may not be immediately useful to this site - but we should seriously consider the long-term here and who we are... It would be nice if this site served as an incubator for future MO users, so I say we should start using the "big boy" tags now.
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$\begingroup$ I couldn't agree more. $\endgroup$– 97832123Commented Jul 21, 2010 at 5:36
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2$\begingroup$ Agreed. It's been proposed elsewhere that MO tags be used for more advanced UG-level questions/where appropiate, but broader general purpose tags for the more basic/standard questions. Seems like the right approach to me. $\endgroup$– NoldorinCommented Jul 21, 2010 at 12:34
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The status end of 2018 is that while the tagging systems of this site and MO evolved somewhat independently, eventually, the MO top-level tags with prefix (with one exception) got introduced on this site as synonyms.
Thus, everybody who wishes to use them can use them. Yet, the immediate motivation for crating them was to simplify migrations. (A migration attempt with no matching tag is rejected.)
The exception is the gm.general-mathematics tag. It is not present as synonym as it seemed not feasible to have this as a tag here. However, it still does work as regards migration.
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$\begingroup$ Assuming the information in this answer is correct, (gm.general-mathematics) is an intrinsic tag on this site. (That's probably what you meant when you said that: "it still does work as regards migration.") $\endgroup$ Commented Dec 30, 2018 at 17:25
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$\begingroup$ Yes, I did not want to enter the technicalities, mostly out of laziness. $\endgroup$– quidCommented Dec 30, 2018 at 17:56