Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A current value Hamiltonian Approach for Discrete time Optimal Control
  Problems arising in Economic Growth   Pontrygin-type maximum principle is extended for the present value
Hamiltonian systems and current value Hamiltonian systems of nonlinear
difference equations for uniform time step $h$. A new method termed as a
discrete time current value Hamiltonian method is established for the
construction of first integrals for current value Hamiltonian systems of
ordinary difference equations arising in Economic growth theory.

24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys