Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new reduction strategy for special negative sectors of planar two-loop
  integrals without Laporta algorithm   In planar two-loop integrals there is a dedicated sector such that when its
index is zero, the two-loop integral decomposes into the product of two
one-loop integrals. We show an alternative reduction strategy for these sectors
when their index is negative using the Baikov representation. This reduction
strategy is free from the Laporta algorithm. It follows a top-down approach and
is much faster than approaches based on the brute-force, conventional
integration by parts identities.

25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph