On a paper by Karel Prikry concerning Ulam's problem on families of measures
On saturated sets of Boolean rings and Ulam's problem on sets measures
On axial maps of direct products, II
Remarks on σ-fields without continuous measures
A solution of a problem of B. Rotman
When ℵ₁ many sets are contained in a countably generated σ-field
We discuss the problem when ℵ₁ sets are contained in a σ-generated σ-field on some set X. This is related to a problem raised by K. P. S. Bhaskara Rao and Rae Michael Shortt [Dissertationes Math. 372 (1998)] which we answer. We also briefly discuss generating the family of all subsets from rectangles.
On sets always of the first category
On Ulam's problem on families of measures
On universal null and universally measurable sets, II
A remark on a paper by Karel Prikry
Remarks on -fields without continuous measure
Always of the first category sets (II)
Always of the first category sets
Complementation in the lattice of Borel structures
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