Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Moduli of Reflexive Sheaves on Smooth Projective 3-folds   We compute the expected dimension of the moduli space of torsion-free rank 2
sheaves at a point corresponding to a stable reflexive sheaf and give
conditions for the existence of a perfect tangent-obstruction complex on a
class of smooth projective threefolds; this class includes Fano and Calabi-Yau
threefolds. We also explore both local and global relationships between moduli
spaces of reflexive rank 2 sheaves and the Hilbert scheme of curves.

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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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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: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas