ACTA SCIENTIARUM MATHEMATICARUM (Szeged)

Nilpotent groups and automorphisms

J. Dauns, K. H. Hofmann

Square extensions of finite rings

L. C. A. van Leeuwen

Über die Struktur der Hauptidealhalbgruppen. I

L. Megyesi, G. Pollák

On oscillation of the number of primes in an arithmetical progression

I. Kátai

Quasitriangular operators

P. R. Halmos

A characterization of thin operators

R. G. Douglas, C. Pearcy

On the power-bounded operators of Sz.-Nagy and Foiaş

J. A. R. Holbrook

A remark on a class of power-bounded operators in Hilbert space

V. Istratescu

A problem on lacunary series

R. Kaufman

On general multiplication of infinite series

L. G. Pál

On a problem of summability of orthogonal series

F. Móricz, K. Tandori

Berichtigung zur Arbeit ``Über die starke Summation von Fourierreihen''

K. Tandori, F. Móricz