Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: EP modular operators and their products   We study first EP modular operators on Hilbert C*-modules and then we provide
necessary and sufficient conditions for the product of two EP modular operators
to be EP. These enable us to extend some results of Koliha [{\it Studia Math.}
{\bf 139} (2000), 81--90.] for an arbitrary C*-algebra and the C*-algebras of
compact operators.

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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs