ACTA SCIENTIARUM MATHEMATICARUM (Szeged)

The convex structure of the set of positive approximants for a given operator

R. Bouldin

Subnormal operators with nontrivial quasinormal extensions

S. L. Campbell

Note

L. T. Gardner

Factorization of operators in $C_\varrho$ classes

E. Durszt

Power-bounded operators with invertible characteristic function

P. Ghatage

Strongly reductive operators

K. J. Harrison

Integrability theorems for Jacobi series and Parseval's formulae

Y. Hasegawa

On the strong stability by Lyapunov's direct method

L. Hatvani

On the invariant subspace lattice $1+\omega^*$ (Corrigendum)

D. A. Herrero

Canonical number systems for complex integers

I. Kátai, J. Szabó

Note on integral inequalities

L. Leindler

Tensor product of Hilbert lattices and free orthodistributive product of orthomodular lattices

T. Matolcsi

Invariant subspaces of von Neumann algebras

C. Peligrad

On a generalization of the concept of orthogonality

F. Schipp

On orthogonal trigonometric polynomials

I. Szalay

On non-localizable measure spaces

J. Szűcs

Zur Eindeutigkeit des Holomorphs bestimmter Ringe

L. Warlich

On nonorthogonal decompositions of certain contractions

P. Y. Wu

Remark on the Jordan model for contractions of class $C_0$

B. Moore, E. A. Nordgren

Compléments à l'étude des opérateurs de classe $C_0$. III

H. Bercovici, C. Foiaş, B. Sz.-Nagy

Untersuchungen über äquivalente Variations-probleme von mehreren Veränderlichen

A. Moór

On the theory of Finsler connections especially their equivalence

P. T. Nagy

On hereditarily finitely based varieties of semigroups

Gy. Pollák