Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diagonal symmetrizers for hyperbolic operators with triple
  characteristics   Symmetrizers for hyperbolic equations are obtained by diagonalizing the
Bezoutian matrix of hyperbolic symbols. Such diagonal symmetrizers are applied
to the Cauchy problem for hyperbolic operators with triple characteristics. In
particular, the V.Ivrii's conjecture concerned with triple effectively
hyperbolic characteristics is proved for differential operators with
coefficients depending on the time variable.

5
The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
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The categories of this paper are: eess
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys