ACTA SCIENTIARUM MATHEMATICARUM (Szeged)

On the stability of the zero solution of certain second order non-linear differential equations

L. Hatvani

Über die unbedingte Konvergenz der Orthogonalreihen

K. Tandori

On the strong approximation of orthogonal series

L. Leindler

On generalized absolute Cesàro summability of orthogonal series

I. Szalay

On the divergence of rearranged Fourier series of square integrable functions

S. Nakata

Über eine neue Klasse von Mittelwerten

L. Losonczi

Generalization of a theorem of A. and C. Rényi on periodic functions

W. H. J. Fuchs, F. Gross

The value distribution of composite entire functions

I. N. Baker

Spectra of some Hausdorff operators

B. E. Rhoades

Probabilistic version of Trotter's exponential product formula in Banach algebras

A. Lenard

Hyperinvariant subspaces for $n$-normal operators

T. B. Hoover

Hyperinvariant subspaces for spectral and $n$-normal operators

H. Radjavi, P. Rosenthal

Operators with bounded characteristic function and their $J$-dilation

Ch. Davis, C. Foiaş

O kharakteristicheskikh funktsiyakh obratimogo operatora

V. M. Brodskii, I. Ts. Gohberg, M. G. Krein

Teoremy umnozheniya i deleniya kharakteristicheskikh funktsii obratimogo operatora

V. M. Brodskii

Vecteurs cycliques et commutativité des commutants

C. Foiaş, B. Sz.-Nagy

Bi-ideals in associative rings

S. Lajos, F. Szász

Local and residual properties in bicategories

R. Wiegandt