Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Art of Frame Theory   Thye theory of frames for a Hilbert space plays a fundamental role in signal
processing, image processing, data compression, sampling theory and much more,
as well as being a fruitful area of research in abstract mathematics. In this
``tutorial'' on abstract frame theory, we will try to point out the major
directions of research in abstract frame theory and give some sample techniques
from each of the areas. We will also bring out some of the important open
questions, discuss some of the limitations of the existing theory, and point to
some new directions for research.

15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph