Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graphite on graphite   We propose potential geometry for fabrication of the graphite sheets with
atomically smooth edges. For such sheets with Bernal stacking, the
electron-electron interaction and topology should cause sufficiently high
density of states resulting in the high temperature of either spin ordering or
superconducting pairing.

2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ