Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlinear differential equations with exact solutions expressed via the
  Weierstrass function   New problem is studied that is to find nonlinear differential equations with
special solutions expressed via the Weierstrass function. Method is discussed
to construct nonlinear ordinary differential equations with exact solutions.
Main step of our method is the assumption that nonlinear differential equations
have exact solutions which are general solution of the simplest integrable
equation. We use the Weierstrass elliptic equation as a building block to find
a number of nonlinear differential equations with exact solutions. Nonlinear
differential equations of the second, third and fourth order with special
solutions expressed via the Weierstrass function are given. Most of these
equations are used at the description of nonlinear waves in physics.

26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
1
The categories of this paper are: cs
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess