Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the unitary subgroup of modular group algebras   It this note we investigate the structure of the group of \sigma-unitary
units in some noncommutative modular group algebras KG, where \sigma is a
non-classical ring involution of KG.

37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph