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Linear representations of algebras and groups, Lie theory, associative algebras, multilinear algebra.

3 votes

Isomorphisms $S^d(S^m(V)^*) \cong \Lambda^d(S^{m+d-1}(V)^*)$

If I remember correctly, one of the symmetric powers should become divided powers. A quick google search brought me to Section 3.4 of Aprodu, Farkas, Papadima, Raicu, and Weyman - Koszul modules and G …
LSpice's user avatar
  • 12.9k
7 votes

Cohomology of the partial flag variety associated with the minimal nilpotent orbit

I think this might be so standard that there is no obvious reference. The cohomology has a basis of Schubert classes. In the adjoint case, Schubert classes are indexed by the Weyl group orbit of the h …
Vladimir Dotsenko's user avatar
5 votes

Gröbner/SAGBI bases for non-commutative setting

There are lots of papers dealing with representation-theoretic questions and universal enveloping algebras using Gröbner bases. Some examples are given by these: 1, 2, 3, 4.
Robert Furber's user avatar
10 votes
2 answers
214 views

Degree 8 multilinear operations on Jordan algebras

I am interested in the dimension, or, even better, in the $S_8$-module structure of the space of degree 8 multilinear operations on Jordan algebras. Recall that a Jordan algebra is a commutative but n …
1 vote

Degree 8 multilinear operations on Jordan algebras

I managed to run Albert on a very powerful computer at work, and the computation of the desired dimension converged: it seems equal to 19089. I would very much like to confirm that it is correct (I am …
Vladimir Dotsenko's user avatar
1 vote

A (bi)alternant formula for Wronskian

There is an instance where the two formulas are very close: if $f_1,\ldots,f_n$ are fundamental solutions of a linear ODE with indeterminate (constant) coefficients. This is explained in the elegant p …
Vladimir Dotsenko's user avatar
3 votes

The dimension of the Grassmannian cohomology ring $H^*(\mathrm{Gr}_{n,d})$ and the fundament...

I accidentally (looking for something else) came across another paper where a very elegant explanation is given: Dan Laksov, Anders Thorup: Schubert Calculus on Grassmannians and Exterior Powers India …
Vladimir Dotsenko's user avatar
10 votes
Accepted

The dimension of the Grassmannian cohomology ring $H^*(\mathrm{Gr}_{n,d})$ and the fundament...

This is very standard. For a compact complex variety admitting a cell decomposition, the (co)homology is the free Abelian group generated by the cells (over $\mathbb{C}$ there is no room for the diffe …
Vladimir Dotsenko's user avatar
2 votes

Using Schur-Weyl duality

In your context, you want to think of the Schur-Weyl duality as a way to construct representations of $GL(V)$ out of representations of symmetric groups. To give a precise answer along these lines tha …
Vladimir Dotsenko's user avatar
3 votes
Accepted

Generators of polynomial invariant ring of compact Lie groups

The method/result you are looking for is commonly known under the name "unitary trick" (of Hurwitz and Weyl), - this keyword should bring you a great deal of accessible explanations of all possible le …
Vladimir Dotsenko's user avatar
10 votes
Accepted

Breaking up the free Lie algebra into GL irreps

The Whitehouse module referred to in one of the other answers is not necessary, since it is related to the cyclic operad Lie, that is to the representation of $S_{n+1}$ in $Lie(n)$. The decomposition …
Martin Sleziak's user avatar
2 votes

Twisted affine Lie algebras, Lie bracket and normalized standard invariant form

I think that there is just a little mess between things that are denoted $K$, $K'$ in the book, as well as $d$, $d'$. For that, let us examine these formulas carefully. Using the first formula for the …
Vladimir Dotsenko's user avatar
7 votes

Name for algebra and its tensor products

As requested, I elaborate on my comment. First of all, let me make a change of variables $a_i=U_i-1$. The relations then become $a_i+1=a_{i-1}a_{i+1}$. For $n=2,3,4$ I used the Magma online calcula …
Vladimir Dotsenko's user avatar
2 votes

Jack polynomials and the Witt algebra

There are two very famous instances of Jack polynomials in relationship to the Virasoro algebra (there are some others, but they very often seem to be related to one of these): Katsuhisa Mimachi and …
Vladimir Dotsenko's user avatar
6 votes
Accepted

Commutator of finite global dimension algebras

Yes. See the result of Section 2.5 of a wonderful paper of Bernhard Keller : https://webusers.imj-prg.fr/~bernhard.keller/publ/ilc.pdf (and the references therein).
Vladimir Dotsenko's user avatar

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