Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Yo-yo Oscillator (Analysis of a Nonlinear System using Spice)   Unlike the simplest (Hooke's law spring) oscillator, where the restoring
force is in magnitude proportional to the displacement; the yo-yo oscillator
has a constant force-magnitude. In other words, its potential energy function
is linear, as contrasted to the quadratic (harmonic) potential of the simple
harmonic oscillator. The linear potential is responsible for a nonlinear
equation of motion which yields many surprising solutions. Rich in complexity,
these solutions are in some cases chaotic. Numerical solutions to the equation
of motion are presently obtained using the 'simulation program for integrated
circuit engineering' (Spice). The circuit employed involves operational
amplifiers and solid state switches.

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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: econ