Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Lema\^{i}tre-Tolman-Bondi model: fractality, bang time, and Hubble law
  I. Initial conditions and compatibility of density and velocity laws
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int