Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The phenomenon of reversal in the Euler-Poincar\`e-Suslov nonholonomic
  systems   In this paper, the dynamics of nonholonomic systems on Lie groups with a
left-invariant kinetic energy and left-invariant constraints are considered.
Equations of motion form a closed system of differential equations on the
corresponding Lie algebra. In addition, the effect of change in the stability
of steady motions of these systems with the direction of motion reversed (the
reversal found in rattleback dynamics) is discussed. As an illustration, the
rotation of a rigid body with a fixed point and the Suslov nonholonomic
constraint as well as the motion of the Chaplygin sleigh is considered.

13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol