Abstracts of papers published in 1983

A. Pelc, K. Prikry, On a problem of Banach, Proceedings of the American Mathematical Society 89 (1983), pp. 608-610.


Assuming the continuum hypothesis, we obtain a translation invariant version of the following result of E. Grzegorek: There are two countably generated sigma-algebras on the interval [0,1] such that both carry a nonatomic countably additive probability measure, but the sigma-algebra generated by their union does not carry any such measure.