Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Products of general Menger spaces   We study products of general topological spaces with Menger's covering
property, and its refinements based on filters and semifilters. To this end, we
extend the projection method from the classic real line topology to the Michael
topology. Among other results, we prove that, assuming \CH{}, every
productively Lindel\"of space is productively Menger, and every productively
Menger space is productively Hurewicz. None of these implications is
reversible.

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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
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The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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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: math-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin