Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cooper problem in a lattice   Cooper problem for interacting fermions is solved in a lattice. It is found
that the binding energy of the Cooper problem can behave qualitatively
differently from the gap parameter of the BCS theory and that pairs of non-zero
center of mass momentum are favored in systems with unequal Fermi energies.

20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs