All Questions
4 questions
4
votes
0
answers
272
views
Representations of $\mathrm{sl}(3,\mathbb{C})$ and Catalan-like paths
Background on representations of $\mathrm{sl}(3,\mathbb{C})$
In Chapter 6 of Brian C. Hall's book "Lie Groups, Lie Algebras, and Representations", he constructs the irreducible ...
7
votes
1
answer
318
views
Number of tilting modules
Let $A=A_n$ be the algebra of upper triangular matrices over a field $K$ with $n$ simple modules.
It is a nice result that there are $C_{n+1}=1,2,5,14,...$ (Catalan numbers for $n \geq 1$) tilting $...
9
votes
3
answers
1k
views
Catalan numbers as sums of squares of numbers in the rows of the Catalan triangle - is there a combinatorial explanation?
This question arose from an answer to my recent question How many traces are there on Temperley-Lieb, Fuss-Catalan, Iwahori-Hecke, Birman-Wenzl-Murakami-Kauffman, ... algebras?
What I need from that ...
35
votes
4
answers
4k
views
How does this relationship between the Catalan numbers and SU(2) generalize?
This is a question, or really more like a cloud of questions, I wanted to ask awhile ago based on this SBS post and this post I wrote inspired by it, except that Math Overflow didn't exist then.
As ...