Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the extension of the Obukhov theorem in non-Riemannian gravity I   This is a first paper of a series in which we give some generalizations of
the Obukhov theorem in the Tucker-Wang approach to Metric- Affine gravity in
which we consider more general actions containing scalar and in general fields
which do not depend on the metric or connection.

24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph