Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The failure of the fractal uncertainty principle for the Walsh--Fourier
  transform   We construct $\delta$-regular sets with $\delta\ge \frac12$ for which the
analog of the Bourgain--Dyatlov Fractal Uncertainty Principle fails for the
Walsh--Fourier transform.

31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin