Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Editorial for the Special Issue 100 Years of Chronogeometrodynamics: The
  Status of the Einstein's Theory of Gravitation in Its Centennial Year   The present Editorial introduces the Special Issue dedicated by the journal
Universe to the General Theory of Relativity, the beautiful theory of
gravitation of Einstein, a century after its birth. It reviews some of its key
features in a historical perspective, and, in welcoming distinguished
researchers from all over the world to contribute it, some of the main topics
at the forefront of the current research are outlined.

29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph