1. On the integral of operator transformations

   • T. Fényes

   OriginalPaper Pages: 83 - 90

2. The properties of the solutions of certain quasilinear differential equations of the fifth order

   • Rahmi Ibrahim Ibrahim Abdel Karim

   OriginalPaper Pages: 91 - 102

3. On semigroups, in which products are equal to one of the factors

   • J. Pelikán

   OriginalPaper Pages: 103 - 106

4. Bemerkungen zum Parkettierungsproblem des hyperbolischen Raumes

   • I. Vermes

   OriginalPaper Pages: 107 - 115

5. Chromatic numbers of subgraphs

   • F. Galvin

   OriginalPaper Pages: 117 - 119

6. Antifactors of graphs

   • L. Lovász

   BriefCommunication Pages: 121 - 123

7. Vollständig interne Charakterisierungen der T₂-kompaktifizierbaren Räume

   • E. Deák
   • P. Hamburger

   OriginalPaper Pages: 125 - 145

8. Einseitige Approximation durch Polynome in [0, ∞)

   • G. P. Névai

   OriginalPaper Pages: 147 - 156

9. On the geodesic diameter of convex surfaces

   • E. Makai Jr.

   OriginalPaper Pages: 157 - 161

10. On a cyclic inequality

    • Á. Elbert

    OriginalPaper Pages: 163 - 168

11. Über Gruppoid-Verbände II (Zerlegungssätze)

    • O. Steinfeld

    OriginalPaper Pages: 169 - 181

12. Prior-type modal logic II

    • I. Ruzsa

    OriginalPaper Pages: 183 - 201

13. Zur Existenz vollständiger Orthogonal-Systeme, welche kein multiplikativ-orthogonales Teilsystem enthalten

    • H. Fiedler
    • R. Trautner

    OriginalPaper Pages: 203 - 205

14. Order and type of basic sets of polynomials associated with functions of algebraic semi block matrices

    • R. H. Makar
    • L. Fawzy

    OriginalPaper Pages: 207 - 215

15. On a class of finite lattices

    • M. Ajtai

    OriginalPaper Pages: 217 - 220

16. Five-neighbour packing of convex discs

    • L. Fejes Tóth

    OriginalPaper Pages: 221 - 230

17. Research problems

    • A. Hajnal
    • L. Fejes Tóth

    OriginalPaper Pages: 231 - 232