Tests \`a la Hurewicz dans le plan
classification
🧮 math.LO
math.GN
keywords
setsborelpolishbecomecannotchangingcharacterizationcountable
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We give, for some Borel sets of a product of two Polish spaces, including the Borel sets with countable sections, a Hurewicz-like characterization of those which cannot become a transfinite difference of open sets by changing the two Polish topologies.
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