Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Simplest Hamiltonian Systems   Simple Hamiltonian systems, such as mathematical pendulum or Euler equations
for rigid body, are solved without computation. It is nothing but a joke but
maybe you will find it nice.

6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math