Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A weak-type orthogonality principle   We prove a weak-type estimate for a class of operators extending some of the
almost orthogonality issues involved in the study of the bilinear Hilbert
transform by Lacey and Thiele.

9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin