Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spacetime interpretation of Torsion in Prismatic Bodies   A non-linear theory for the plastic deformation of prismatic bodies is
constructed which interpolates between Prandtl's linear soap-film approximation
and N\'adai's sand-pile model . Geometrically Prandtl's soap film and N\'adai's
wavefront are unified into a single smooth surface of constant mean curvature
in three-dimensional Minkowski spacetime. Although the theory is non-linear, a
general solution may be given in terms of a freely specifiable holomorphic
function of a single complex variable.

26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int