tea.mathoverflow.net - Discussion Feed (Creating a G_2 tag)

Emerton comments on "Creating a G_2 tag" (12594)

Emerton — Wed, 12 Jan 2011 19:25:50 -0800

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.

Noah Snyder comments on "Creating a G_2 tag" (12589)

Noah Snyder — Wed, 12 Jan 2011 17:03:16 -0800

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.

Scott Morrison comments on "Creating a G_2 tag" (12564)

Scott Morrison — Wed, 12 Jan 2011 14:34:25 -0800

[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.

Spiro Karigiannis comments on "Creating a G_2 tag" (12562)

Spiro Karigiannis — Wed, 12 Jan 2011 14:02:23 -0800

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.

Harry Gindi comments on "Creating a G_2 tag" (12556)

Harry Gindi — Wed, 12 Jan 2011 12:38:00 -0800

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).

Anton Geraschenko comments on "Creating a G_2 tag" (12555)

Anton Geraschenko — Wed, 12 Jan 2011 12:14:50 -0800

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].

Mariano comments on "Creating a G_2 tag" (12553)

Mariano — Wed, 12 Jan 2011 11:24:53 -0800

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...)