Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A trilinear approach to square function and local smoothing estimates
  for the wave operator   The purpose of this paper is to improve the known estimates for Mockenhaupt's
square function in $\mathbb R^3$ and for Sogge's local smoothing in $\mathbb
R^{2+1}$ spacetime. For this we use the trilinear approach of S. Lee and A.
Vargas for the cone multiplier with some trilinear estimates obtained from the
$\ell^2$ decoupling theorem and multilinear restriction theorem.

20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph