I am told that by means of continued fractions, Lusin or somebody else, has constructed examples of Lebesque measurable sets which are not Borel measurable. Please, if you know a reference help me.
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closed as too localized by Zev Chonoles, Andreas Blass, Simon Thomas, Mark Meckes, George Lowther Jun 13 '12 at 15:41
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See this this post from long ago 

