Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum graph spectra of a graphyne structure   We study the dispersion relations and spectra of invariant Schr\"odinger
operators on a graphyne structure (lithographite). In particular, description
of different parts of the spectrum, band-gap structure, and Dirac points are
provided.

1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an