Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the exact discretization of the classical harmonic oscillator
  equation   We discuss the exact discretization of the classical harmonic oscillator
equation (including the inhomogeneous case and multidimensional
generalizations) with a special stress on the energy integral. We present and
suggest some numerical applications.

3
The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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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: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci