Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Hochschild cohomology and the automorphism group of U_q(sl_4^+)   We compute the automorphism group of the q-enveloping algebra U_q(sl_4^+) of
the nilpotent Lie algebra of strictly upper triangular matrices of size 4. The
result obtained gives a positive answer to a conjecture of Andruskiewitsch and
Dumas. We also compute the derivations of this algebra and then show that the
Hochschild cohomology group of degree 1 of this algebra is a free (left)-module
of rank 3 (which is the rank of the Lie algebra sl(4)) over the center of
U_q(sl_4^+).

13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
19
The categories of this paper are: eess