Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetric Bush-type Hadamard matrices of order $4m^4$ exist for all odd
  $m$   Using reversible Hadamard difference sets, we construct symmetric Bush-type
Hadamard matrices of order $4m^4$ for all odd integer $m$.

9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int