In mathematics, a **Vitali set** is an elementary example of a set of real numbers that is not Lebesgue measurable, found by Giuseppe Vitali (1905). The **Vitali theorem** is the existence theorem that there are such sets. There are uncountably many Vitali sets, and their existence is proven on the assumption of the axiom of choice.

Read more about Vitali Set: Measurable Sets, Construction and Proof

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