Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Near Optimal Spectral Expander Graphs of Fixed Size   We present a pair of heuristic algorithms. The first is to generate a random
regular graph of fixed size. The second is the introduction of the Metropolis
Coupled Simulated Annealer (MCSA) for optimizing spectral gaps in fixed size
regular graphs.

28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg