Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 2 PN/RM metric of General Relativity   We present a derivation of 2PN/RM metric field equations from the Einstein
field equation in General Relativity. We use the exponential parametrization
and the $c^{-3}$ isotropic spatial coordinates such as in IAU2000
recommendations.

16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org