Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the backward uniqueness property for a class of parabolic operators   We give sharp regularity conditions, ensuring the backward uniquess property
to a class of parabolic operators.

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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: cs