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How do I: Creating a G_2 tag

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    • CommentAuthorMariano
    • CommentTimeJan 12th 2011
     

    I've just tried to search for questions/answers involving G_2 (after reading Spiro Karigiannis' extremely nice answer http://mathoverflow.net/questions/49357/g-2-and-geometry/49389) and MO's search engine does not seem to be able to find much.

    Can you think of a way to search for the relevant question/answers so that I can then tag them with a "g2" tag?

    (There is an "exceptional-groups" tag, not used a lot...)

  2.  

    It appears that the search function on MO strips out the underscore. The easiest thing might be to use the google search site:http://mathoverflow.net G_2

    I feel like the [exceptional-groups] tag would be better than a tag like [g-2], even if the question is about a specific exceptional group. I can imagine somebody following the [exceptional-groups] tag, but it's hard for me to imagine somebody following [g-2] without also following [exceptional-groups].

    • CommentAuthorHarry Gindi
    • CommentTimeJan 12th 2011 edited
     

    By the way, if you're ever searching for mathematical notation and you want to search for special characters, you often have to use a different search engine (if I remember correctly, Microsoft's Bing works), since google purposely strips them out (although I really don't think their reasoning for doing so is legitimate).

  4.  
    This would be great. I have just been clicking these as "favourites" up to now. Here's one question about G_2 (or about its Lie algebra):

    http://mathoverflow.net/questions/50166/the-exceptional-lie-algebra-mathfrakg-2-and-binary-cubics

    However, I think that a more interesting/relevant tag could be "octonionic-geometry" or something like that. In that case, while the above question doesn't really fit, all of the following questions do fit into "octonionic-geometry":

    http://mathoverflow.net/questions/1922/what-is-the-cayley-projective-plane

    http://mathoverflow.net/questions/1973/is-there-a-complex-structure-on-the-6-sphere

    http://mathoverflow.net/questions/49357/g-2-and-geometry

    http://mathoverflow.net/questions/19929/is-there-a-general-statement-about-structures-on-spheres-relating-to-division-alg

    http://mathoverflow.net/questions/40151/how-do-jordan-algebras-help-one-understand-representations-of-exceptional-lie-alg

    http://mathoverflow.net/questions/51157/analogues-of-cayley-plane-as-homogenous-spaces

    http://mathoverflow.net/questions/16048/is-there-a-name-for-this-algebraic-structure

    (I plan to ask more questions related to octonionic geometry in the future, so I would certainly make good use of such a tag.
  5.  

    [octonionic-geometry] sounds like a great tag. I'm in favor of [g2] as well; in practice people often talk much more concretely about G2 than the other exceptionals.

  6.  
    Despite being a huge fan of g2, I agree with Anton that [exceptional-groups] makes more sense. Most stuff in [exceptional-groups] will concern G2 or E8, but when there's ocassionally something about another group I'd want to see that too.
    • CommentAuthorEmerton
    • CommentTimeJan 12th 2011
     

    I don't see the problem with having both [g2] and [exceptional-groups] as tags. I think we've agreed in the past that as long as people have a use for them, highly specific tags are fine.

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