Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Addendum: Symmetries of the energy-momentum tensor   In recent papers [1-3], we have discussed matter symmetries of non-static
spherically symmetric spacetimes, static plane symmetric spacetimes and
cylindrically symmetric static spacetimes. These have been classified for both
cases when the energy-momentum tensor is non-degenerate and also when it is
degenerate. Here we add up some consequences and the missing references about
the Ricci tensor.

10
The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph