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Apr
28
comment Is there a definitive guide to speaking mathematics?
I think you need to be more specific. I for one, don't understand what the text would look like or what sort of standard you are thinking of.
Apr
22
comment Topological K-theory references
Good point! I like that book a lot.
Apr
22
comment Topological K-theory references
That chapter of May is really cool!
Apr
22
comment The 9 Billion Names of God
'tis fine. It's the whole Internet-removes-intonation thing.
Apr
22
comment The 9 Billion Names of God
Of course, this is fine. But next time eschew the condescension. If you don't know how perhaps you could ask this as a meta question.
Apr
21
comment The 9 Billion Names of God
I'm sorry but I still don't see the expression. Could you be a bit more explicit.
Apr
21
comment The 9 Billion Names of God
The question says the alphabet is 9 characters or less.
Apr
21
revised Automorphism group of Fano Plane
added some more details.
Apr
21
answered Automorphism group of Fano Plane
Apr
21
comment The 9 Billion Names of God
Is there a nice expression for the partial sums of $\sum G_nx^n$?
Apr
21
comment Casimir element of a universal enveloping algebra
over the next couple pages it related these two Casimir elements.
Apr
21
comment Casimir element of a universal enveloping algebra
look carefully! That is for $U_q(sl_2)$ which is actually a deformation of $U(sl_2)$. These are different algebras.
Apr
20
answered Casimir element of a universal enveloping algebra
Apr
18
answered Problems that differential geometry solves
Apr
14
answered Inverse Image as the left adjoint to pushforward
Apr
10
comment Meaning of pullback
Have a look at this question of mine: math.stackexchange.com/questions/10180/…
Apr
6
comment Good resources (book or otherwise) to learn/study basic Combinatorics
@Fixee there have been many many editions.
Mar
28
comment Question about notation / terminology
you should consider a different title that gives an idea of what this question is about.
Mar
16
comment Geometric mean never exceeds arithmetic mean
Not what you are looking for, but the Lagrange multipliers proof is pretty slick. Just take the geometric mean as the function to minimize and the constraint $\sum_{i=1}^n x_i=n$.
Mar
16
comment How to compute the Gel'fand Models for a (quantum) Lie Algebra
@Mariano again thanks for the reference. I have looked through the connections to this paper on google and on MathSciNet to no avail. But I do know some things. In the case of the classical case, using what we know about homogeneous coordinate rings, we can get a decent presentation of the rings by taking the embedding into the product of $Gr(i,n)$ by Plucker relations. An explicit description is found in Miller-Sturmfeld Combinatorial commutative algebra chapter 14. For the quantum case I have no idea. Literally the only thing I can find is the $sl_2$ case,I would be very happy to see others.