Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Products of Block Toeplitz operators   In this paper we characterize when the product of two block Toeplitz
operators is a compact perturbation of a block Toeplitz operator on the Hardy
space of the open unit disk. Necessary and sufficient conditions are given for
the commutator of two block Toeplitz operators to be compact.

26
The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: q-alg