Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Motion of a Rigid Body in Body-Fixed Coordinate System -- for
  Autoparrallel Trajectories in Spaces with Torsion   We use a recently developed action principle in spaces with curvature and
torsion to derive the Euler equations of motion for a rigid body within the
body-fixed coordinate system. This serves as an example that the particle
trajectories in a space with curvature and torsion follow the straightest paths
(autoparallels), not the shortest paths (geodesics), as commonly believed.

18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
9
The categories of this paper are: nlin
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The categories of this paper are: stat
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn