Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transforming a matrix into a standard form   We show that every matrix all of whose entries are in a fixed subgroup of the
group of units of a commutative ring with identity is equivalent to a standard
form. As a consequence, we improve the proof of Theorem 5 in D. Best, H.
Kharaghani, H. Ramp [Disc. Math. 313 (2013), 855--864].

22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
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
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph