Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discrete Toda field equations   Discrete analogs of the finite and affine Toda field equations are found
corresponding to the Lie algebras of series $C_N$ and $\tilde{C_N}$. Their Lax
pairs are represented.

16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th