Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some sharp bilinear space-time estimates for the wave equation   We prove a family of sharp bilinear space-time estimates for the half-wave
propagator. As a consequence, for radially symmetric initial data, we establish
sharp estimates of this kind for a range of exponents beyond the classical
range.

15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga