Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 2D H-atom in an arbitrary magnetic field via pseudoperturbation
  expansions through the quantum number l   The pseudoperturbative shifted-l expansion technique (PSLET) is introduced to
determine nodeless states of the 2D Schrodinger equation with an arbitrary
cylindrically symmetric potentials. Exact energy eigenvalues and eigenfunctions
for the 2D Coulomb and harmonic oscillator potentials are reproduced. Moreover,
exact energy eigenvalues, compared to those obtained by numerical solution
[11], were obtained for the hybrid of the 2D Coulomb and oscillator potentials.

17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas