Determination of measures by their values on balls

Professor Tamas Keleti
Michigan State University

In this talk I will discuss some results concerning thefollowing question and its variations:
     Is it true that if two Borel measures agree on all balls	 then they agree?
I will also present the following recent result (together withits finite dimensional version and other connected results) andits connection with the above question:
    In a separable infinite dimensional Hilbert space not all	Borel sets can be generated by balls using complements	and countable disjoint unions.	
(See also papers 2 and 3 on my home page: www.math.msu.edu/~keleti.)