Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Off-diagonal estimates for commutators of bi-parameter singular
  integrals   We study the boundedness of commutators of bi-parameter singular integrals
between mixed spaces
  $$
  [b,T]: L^{p_1}L^{p_2} \to L^{q_1}L^{q_2}
  $$ in the off-diagonal situation $q_i,p_i\in(1,\infty)$ where we also allow
$q_i\not= p_i.$
  Boundedness is fully characterized for several arrangements of the
integrability exponents with some open problems presented.

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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: cond-mat