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This tag is used if a reference is needed in a paper or textbook on a specific result.
0
votes
Reference for quantum Schur-Weyl duality
This is treated in section 8.6 of the book "Quantum Groups and Their Representations" by Klimyk and Schmudgen, although also not using the quantum coordinate algebra.
10
votes
Lie algebras over non-algebraically closed fields
Well, certainly things get more complicated when the field is not algebraically closed, as you can see from the classification of finite-dimensional simple Lie algebras over $\mathbb{R}$. But there a …
8
votes
2
answers
525
views
Idempotency of the q-antisymmetrizer
Background
When constructing the exterior algebra of a (finite-dimensional, complex) vector space $V$, there are two equivalent pictures. The first is the quotient picture. First you define the ten …
6
votes
Explicit Computations of Examples in Spin Geometry
Appendix A to Chapter 9 of the book Elements of Noncommutative Geometry by Gracia-Bondia, Varilly, and Figueroa is titled "Spin geometry of the Riemann sphere". It is 15 pages long and goes into quit …
5
votes
Accepted
Non-commutative versions of X/G
Noncommutative versions of sheaves and holomorphic functions are not very well understood. Better understood are noncommutative versions of measurable, continuous, or smooth functions. I generally w …
11
votes
A book for problems in Functional Analysis
I realy like the exercises in Gert Pedersen's book Analysis Now.
2
votes
analytic structure on lie groups
I don't know the original reference, but you can find a proof of the theorem about real-analytic structures on Lie groups in Chapter 1 of Knapp's book "Lie Groups Beyond an Introduction." The proof u …
2
votes
Accepted
Completing The Space Sections in a Vectorbundle
This is true in general. I don't know a reference for the statement, but it is pretty simple just to work it out. The point is that $L^2(M,E)$ is a Hilbert space which contains $H_0$ as a dense line …
5
votes
A quantum Grothendieck group?
The forgetful functor from the category of Hopf algebras to the category of bialgebras has a left adjoint. This means that given a bialgebra $B$, there is a Hopf algebra $H(B)$ with a bialgebra morph …
7
votes
1
answer
311
views
Real forms of Drinfeld-Jimbo quantum groups
A real form of a Hopf algebra $H$ over $\mathbb{C}$ is defined to be a $\ast$-structure on $H$ which is compatible with the coproduct. Compatibility of the $\ast$-structure with the counit and antipo …
5
votes
Clifford Lie algebras
A little bit of what you want can be found in Chapter 5 of Gracia-Bondia, Varilly, and Figueroa's book Elements of Noncommutative Geometry. They don't say much about subalgebras, I think, but they do …
14
votes
1
answer
1k
views
2-cocycle twists of braided Hopf algebras
2-cocycle twists of Hopf algebras
Let $H$ be a Hopf algebra over a field $k$. Then a (left, unital) 2-cocycle on $H$ is a map
$$ f: H \otimes H \to k$$
such that
$$ f(x_{(1)},y_{(1)})f(x_{(2)} y_{( …
8
votes
Accepted
Reference for the Hecke relation for the universal R-matrix
For the Drinfeld-Jimbo quantum universal enveloping algebras, see Proposition 24 of Chapter 8 in the book Quantum Groups and Their Representations, by Klimyk and Schmudgen. This relation is just in t …
3
votes
Accepted
Lebesgue integral with respect to vector measures?
Marc Rieffel has some notes that develop integration with respect to Banach-space valued measures from the ground up. The notes are very thorough. They are available here:
http://math.berkeley.edu/~ …
8
votes
Accepted
Criterion for nilradical of a maximal parabolic subalgebra to be abelian?
Denote by $\mathfrak{l}$ the Levi factor of the parabolic, so that $\mathfrak{p} = \mathfrak{l} \oplus \mathfrak{n}$, and note that this is a splitting as $\mathfrak{l}$-modules. Also denote by $\mat …