Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An algebraic description of screw dislocations in SC and BCC crystal
  lattices   We give an algebraic description of screw dislocations in a crystal,
especially simple cubic (SC) and body centered cubic (BCC) crystals, using free
abelian groups and fibering structures. We also show that the strain energy of
a screw dislocation based on the spring model is expressed by the
Epstein-Hurwitz zeta function approximately.

22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat