Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Explicit Noether-Lefschetz for arbitrary threefolds   We study the Noether-Lefschetz locus of a very ample line bundle L on an
arbitrary smooth threefold Y. Building on results of Green, Voisin and
Otwinowska, we give explicit bounds, depending only on the Castelnuovo-Mumford
regularity properties of L, on the codimension of the components of the
Noether-Lefschetz locus of |L|.

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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: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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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: funct-an
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci