Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Covariants of binary sextics and vector-valued Siegel modular forms of
  genus two   We extend Igusa's description of the relation between invariants of binary
sextics and Siegel modular forms of degree two to a relation between covariants
and vector-valued Siegel modular forms of degree two. We show how this relation
can be used to effectively calculate the Fourier expansions of Siegel modular
forms of degree two.

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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio