Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The fundamentals of Spectral Tetris frame constructions   The landmark paper "Constructing tight fusion frames" by Casazza, Fickus,
Mixon, Wang and Zhou introduced a fundamental method for constructing unit norm
tight frames, which they called Spectral Tetris. This was a significant
advancement for finite frame theory - especially constructions of finite
frames. This paper then generated a vast amount of literature as Spectral
Tetris was steadily developed, refined, and generalized until today we have a
complete picture of what are the broad applications as well as the limitations
of Spectral Tetris. In this paper, we will put this vast body of literature
into a coherent theory.

37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int