Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Georges Lema\^itre: Life, Science and Legacy   This paper celebrates the remarkable life, science and legacy of Abb\'e
Georges Lema\^itre, the Belgian cleric and professor of physics; he was the
architect of the fireworks model for the origin of the universe. He died half a
century ago, three days after learning that Arno Penzias and Robert Wilson had
discovered the cosmic microwave background. Despite being gravely ill from
leukaemia, Lema\^itre lucidly praised this news, which confirmed the explosive
genesis of our universe.

31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph