Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A non-geometric representation of the Dirac equation in curved spacetime   We write the Dirac equation in curved 4-dimensional Lorentzian spacetime
using concepts from the analysis of partial differential equations as opposed
to geometric concepts.

26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics