Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Knotted solitons   The dynamical model on 3+1 dimensional spacetime admitting soliton solutions
is discussed. The proposal soliton is localized in the vicinity of a closed
contour, which could be linked and/or knotted. The topological charge is Hopf
invariant. Some applications in realistic physical systems are indicated.

18
The categories of this paper are: econ
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg