Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the structure of the Euler mapping   The goal of this paper is to give acomplete description of the Lagrange
functions L satisfying $\cal E (L)=0$. In other words we shall study the kernel
of the linear mapping $\cal L (J^1) \ni L \to \cal E (L) \in \Omega^1(J^2)$,
which will be referred to as the Euler mapping.

7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin