ACTA SCIENTIARUM MATHEMATICARUM (Szeged)

Congruence lattices on a regular semigroup associated with certain operators

F. Pastijn, M. Petrich

Arithmetical functions satisfying some relations

I. Kátai

A problem of Kátai on sums of additive functions

R. Styer

Number systems in integral domains, especially in orders of algebraic number fields

B. Kovács, A. Pethő

Note on multiplicative functions satisfying a congruence property

I. Joó

Strong limit theorems for quasi-orthogonal random fields. II

F. Móricz

General results on strong approximation by orthogonal series

L. Leindler, A. Meir

On the central limit theorem for series with respect to periodical multiplicative systems. I

S. V. Levizov

Zamykanie v operatornoi oblasti

E. L. Pekarev

Models for operators with trivial residual space

B. W. McEnnis

Hyponormal composition operators on weighted Hardy spaces

N. Zorboska

Essentially normal composition operators on $L^2$

T. Hoover, A. Lambert