Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ballistic magnetoresistance in nickel single-atom conductors   Large ballistic magnetoresistance (BMR) has been measured in Ni single-atom
conductors electrodeposited between microfabricated thin films. These
measurements irrefutably eliminate any magnetostriction related artifacts in
the BMR effect.

12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas