Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The T^1-lifting theorem in positive characteristic   Replacing symmetric powers by divided powers and working over Witt vectors
instead of ground fields, I generalize Kawamatas T^1-lifting theorem to
characteristic p>0. Combined with the work of Deligne-Illusie on degeneration
of the Hodge-de Rham spectral sequences, this gives unobstructedness for
certain Calabi-Yau varieties with free crystalline cohomology modules.

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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin