Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Contact Equivalence of the Generalized Hunter - Saxton Equation and the
  Euler - Poisson Equation   We present a contact transformation of the generalized Hunter--Saxton
equation to the Euler--Poisson equation with special values of the Ovsiannikov
invariants. We also find the general solution for the generalized
Hunter--Saxton equation.

6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat