Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Lie and Cartan Theory of Invariant Differential Systems, III   It is presently our aim to undertake the discussion, of the Parts I and II,
on the infinitesimal level and outline as well the transition from
infinitesimal to finite, the main reason for this being, of course, the well
known fact that arguments and calculation on the infinitesimal level are far
simpler that those on the finite level.

35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin