Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On a generalized Sturm theorem   Sturm oscillation theorem for second order differential equations was
generalized to systems and higher order equations with positive leading
coefficient by several authors. What we propose here is a Sturm oscillation
theorem for systems of even order having strongly indefinite leading
coefficient.

9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex