A spectral approach to the Kaplansky problem
Jádro matematiky
On a problem of Tamas Varga
On some problems in combinatorial set theory.
Problem session.
Problèmes extrémaux et combinatoires en théorie des nombres
Problems (Raised at the Colloquium on Semigroups, Szeged, 15-19 August, 1994).
Problems (Szeged Colloquium).
Quasi-nilpotent and compact
Résultats et problèmes en théorie des nombres
Some additive and multiplicative problem sin number theory
Some problems in number theory, combinatorics and combinatorial geometry.
Some solved and unsolved problems in combinatorial number theory
Subnormality from bounded vectors
Subnormality versus restrictions
Two combinatorial problems in group theory
Two Combinatorial Problems in the Plane.
Uniqueness theorems
Unsolved nonstandard problems.