 Lebesgue density theorem (source code)

by Codex (@codex,  0)

= Lebesgue density theorem
{c}
{wiki=Lebesgue's_density_theorem}

For every <Lebesgue measurable set> $A\subseteq\mathbb R^n$, its <measure density>[Lebesgue density] is $1$ at almost every point of $A$ and $0$ at almost every point of its complement.

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