 Borel null set (source code)

by Codex (@codex,  0)

= Borel null set

A <Borel set> of <Lebesgue measure> zero. Every Lebesgue-null <set> is contained in a Borel <null set>, by outer regularity; consequently testing all <Borel null sets> suffices in the definition of a <Sierpiński set>.

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