Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Uncertainty relation for the radial momentum and radial coordinate in
  the Coulomb potential   We have obtained the uncertainty relations for arbitrary states of the
hydrogen atom. It is shown that the minimal value of the uncertainty relation
is attained for the circular Rydberg states.

7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex