Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Greedy approximation for biorthogonal systems in quasi-Banach spaces   The general problem addressed in this work is the development of a systematic
study of the thresholding greedy algorithm for general biorthogonal systems
(also known as Markushevich bases) in quasi-Banach spaces from a
functional-analytic point of view. We revisit the concepts of greedy,
quasi-greedy, and almost greedy bases in this comprehensive framework and
provide the (nontrivial) extensions of the corresponding characterizations of
those types of bases. As a by-product of our work, new properties arise, and
the relations amongst them are carefully discussed.

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The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
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The categories of this paper are: cs
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The categories of this paper are: hep-th
19
The categories of this paper are: eess
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg