Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conformal and projective tractors from 2-frame bundles by the dressing
  field method   This paper is devoted to the study of conformal and projective structures,
and especially their connections, in the language of 2-frames, or
$G$-structures of 2nd-order. While their normal Cartan connections are
well-known, we use the dressing field method to obtain their local, mostly
gauge invariant, connections. Lastly, we recall how to obtain the tractor
bundle from conformal structures, and then show that we can define a projective
tractor bundle using the same kind of construction.

19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn