Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Martingale problems for some degenerate Kolmogorov equations   We obtain Calder{\'o}n-Zygmund estimates for some degenerate equations of
Kolmogorov type with inhomogeneous coefficients. We then derive the
well-posedness of the martingale problem associated to related degenerate
operators, and therefore uniqueness in law for the corresponding stochastic
differential equations. Some density estimates are established as well.

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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci