Lebesgue steiljes outermeasure

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SUMMARY

The discussion centers on the existence of outer measures in the context of Lebesgue-Stieltjes outer measures and their relationship with m*-null sets. The first question confirms that there exists an outer measure where every m*-null set is countable. However, the second question raises doubts about the existence of a Lebesgue-Stieltjes outer measure with the same property, as the Cantor set serves as a counterexample due to its uncountability and measure zero.

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  • Basic comprehension of the Cantor set and its properties
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Homework Statement



1) does there exist an outer measure where every m* nullset is countable?
2) does there exist a lebesgue steiljes outer measure where every m* nullset is countable?

Homework Equations





The Attempt at a Solution



1) i got an example for it , turned out to be easy and the answer is yes.
2) my intuition is no,
i got some information, like, the set of discontinuities of the corresponding function is countable, and of positive measure.
that every point of continuity is of measure 0 and a point of discontinuity is of +ve measure.
but I am stuck, i cannot proceed.
any ideas? thanks a lot.
 
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jem05 said:

does there exist a lebesgue steiljes outer measure where every m* nullset is countable?


I'm not sure, but the Cantor set is uncountable & has measure zero.
 

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