Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inverted Oscillator   The inverted harmonic oscillator problem is investigated quantum
mechanically. The exact wave function for the confined inverted oscillator is
obtained and it is shown that the associated energy eigenvalues are discrete
and it is given as a linear function of the quantum number $n$.

5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an