Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extremal spectral properties of Lawson tau-surfaces and the Lam\'e
  equation   Extremal spectral properties of Lawson tau-surfaces are investigated. The
Lawson tau-surfaces form a two-parametric family of tori or Klein bottles
minimally immersed in the standard unitary three-dimensional sphere. A Lawson
tau-surface carries an extremal metric for some eigenvalue of the
Laplace-Beltrami operator. Using theory of the Lam\'e equation we find
explicitly these extremal eigenvalues.

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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga