Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proof of a Conjecture of Helleseth: Maximal Linear Recursive Sequences
  of Period $2^{2^n}-1$ Never Have Three-Valued Cross-Correlation   We prove a conjecture of Helleseth that claims that for any $n \geq 0$, a
pair of binary maximal linear sequences of period $2^{2^n}-1$ can not have a
three-valued cross-correlation function.

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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio