Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the universal regular homomorphism in codimension $2$   We point out a gap in Murre's proof of the existence of a universal regular
homomorphism for codimension $2$ cycles on a smooth projective variety, and
offer two arguments to fill this gap.

6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess