An analytic, Borel, or coanalytic set.
Definable Set
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Cite this as:
Weisstein, Eric W. "Definable Set." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DefinableSet.html
An analytic, Borel, or coanalytic set.
Weisstein, Eric W. "Definable Set." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DefinableSet.html