Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A characterization of covering equivalence   Let A={a_s(mod n_s)}_{s=1}^k and B={b_t(mod m_t)}_{t=1}^l be two systems of
residue classes. If |{1\le s\le k: x=a_s (mod n_s)}| and |{1\le t\le l: x=b_t
(mod m_t)}| are equal for all integers x, then A and B are said to be covering
equivalent. In this paper we characterize the covering equivalence in a simple
and new way. Using the characterization we partially confirm a conjecture of R.
L. Graham and K. O'Bryant.

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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin