Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positive topological entropy for multi-bump magnetic fields   We study the dynamics of a charged particle in a planar magnetic field which
consists of $n\geq 2$ disjoint localized peaks. We show that, under mild
geometric conditions, this system is semi-conjugated to the full shift on $n$
symbols and, hence, carries positive topological entropy.

16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph