Standard Space
A space which is isomorphic to a Borel subset B of a Polish space equipped with its sigma-algebra of Borel sets.
See also
Borel Set, Polish Space, Sigma-AlgebraExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Standard Space." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/StandardSpace.html