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Math Help - Vitali set

  1. #1
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    Vitali set

    I need help with this problem, i couldn't find a proof in any book related to measure theory.
    Show that every Lebesgue measurable subset of a Vitali set V is a Lebesgue nullset.
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  2. #2
    MHF Contributor Bruno J.'s Avatar
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    Translates of the Vitali set are disjoint from it.
    Suppose it had a measurable subset of nonzero measure. By translating this subset by all rationals in the unit interval, you obtain a countable collection of disjoint sets of real numbers in the interval [0,2], who all have the same nonzero measure (by translation invariance of measure); their countable union is measurable, and since it's a subset of [0,2], it must have finite measure. See what you can make of all this.
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  3. #3
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    Thanks, i did not know these facts from before..
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