Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exercising in K-theory: Brane Condensation without Tachyon   We show that the p-dimensional noncommutative Yang--Mills model corresponding
to a (p-1)-brane allows solutions which correspond to lower branes. This may be
interpreted as the Morita equivalence of noncommutative planes of various
dimensions.

18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con