Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Buryak-Okounkov formula for the $n$-point function and a new proof of
  the Witten conjecture   We identify the formulas of Buryak and Okounkov for the n-point functions of
the intersection numbers of psi-classes on the moduli spaces of curves. This
allows us to combine the earlier known results and this one into a principally
new proof of the famous Witten conjecture / Kontsevich theorem, where the link
between the intersection theory of the moduli spaces and integrable systems is
established via the geometry of double ramification cycles.

18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga