Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Linear Expand-Contract Plasticity of Ellipsoids Revisited   This work is aimed to describe linear expand-contract plastic ellipsoids
given via quadratic form of a bounded positively defined self-adjoint operator
in terms of its spectrum.

9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ