Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Commutativity of normal compact operator via projective spectrum   In this note we obtain commutativity criteria for normal compact operators
using the projective spectrum. We thus improve a corresponding result obtained
by Chagouel, Stessin and Zhu[Trans AMS,2016].

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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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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: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: q-fin