Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Borg-Levinson theorem for higher order elliptic operators   We establish the Borg-Levinson theorem for elliptic operators of higher order
with constant coefficients. The case of incomplete spectral data is also
considered.

6
The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg