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.
closed as too localized by Zev Chonoles, Andreas Blass, Simon Thomas, Mark Meckes, George Lowther Jun 13 '12 at 15:41
This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.