1. Additive selections of superadditive set-valued functions

   • A. Smajdor

   Research Papers Pages: 121 - 128

2. On the graph of a quasi-additive function

   • M. Baran

   Research Papers Pages: 129 - 133

3. Circles and spheres in pseudo-Riemannian geometry

   • N. Abe
   • Y. Nakanishi
   • S. Yamaguchi

   Research Papers Pages: 134 - 145

4. On the chromatic number of rational five-space

   • Kiran B. Chilakamarri

   Research Papers Pages: 146 - 148

5. Trivialization of fans in planar ternary rings with rational prime field

   • Franz B. Kalhoff

   Research Papers Pages: 149 - 160

6. Doubly transitive permutation groups with abelian stabilizers

   • Gy. Károlyi
   • S. J. Kovács
   • P. P. Pálfy

   Research Papers Pages: 161 - 166

7. Kopplungen auf einem quadratischen Zahlkörper und eine Basis seiner Normengruppe

   • Detlef Gröger

   Research Papers Pages: 167 - 178

8. Quasi-additive functions

   • J. Tabor

   Research Papers Pages: 179 - 197

9. On the mean value property of finely harmonic and finely hyperharmonic functions

   • B. Fuglede

   Research Papers Pages: 198 - 203

10. Mittelwertungleichungen für Lösungen gewisser Differenzengleichungen

    • Lutz G. Lucht

    Research Papers Pages: 204 - 209

11. Supernumary polylogarithmic ladders and related functional equations

    • L. Lewin
    • M. Abouzahra

    Research Papers Pages: 210 - 253

12. All 11₃ and 12₃-configurations are rational

    • Bernd Sturmfels
    • Neil White

    Research Papers Pages: 254 - 260

13. A conjecture of Gy. Petruska

    • V. Totik

    Research Papers Pages: 261 - 263

14. The Twenty-seventh International Symposium on Functional Equations, August 14–24, 1989, Bielsko-BiałKatowice—Kraków, Poland

    • J. Aczél
    • F. Stehling

    Report of Meeting Pages: 264 - 329