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Questions about abstract measure and Lebesgue integral theory. Also concerns such properties as measurability of maps and sets.

26 votes
4 answers
2k views

Does every set of reals contain a measure-zero set of the same cardinality? Does it contain ...

This question arises from an issue in my post on Ashutosh's excellent question on Restrictions of the null/meager ideal. Question 1. Does every set of reals contain a measure-zero subset of the same …
Joel David Hamkins's user avatar
92 votes
3 answers
14k views

Is every sigma-algebra the Borel algebra of a topology?

This question arises from the excellent question posed on math.SE by Salvo Tringali, namely, Correspondence between Borel algebras and topology. Since the question was not answered there after some ti …
Joel David Hamkins's user avatar
13 votes
1 answer
746 views

Is there a class of mathematical structures with non-isomorphic natural representations as a...

Background. The field of Borel equivalence relation theory provides a robust, unifying theory that organizes most of the classification problems of classical mathematics into a hierarchy, allowing us …
Joel David Hamkins's user avatar