Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cohomology of algebras over weak Hopf algebras   In this paper we present the Sweedler cohomology for a cocommutative weak
Hopf algebra H. We show that the second cohomology group classifies completely
the weak crossed products, having a common preunit, of H with a commutative
left H-module algebra A.

29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn