Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A mass-extended 't Hooft-Nobbenhuis complex transformations and their
  consequences   We have extended the 't Hooft-Nobbenhuis complex transformations to include
mass. Under these new transformations, Schrodinger, Dirac, Klein-Gordon and
Einstein general relativity equations are invariant. The non invariance of the
cosmological constant in Einstein field equations dictates it to vanish thus
solving the longstanding cosmological constant problem.

28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat