1. A rigidity theorem for group extensions

   • F. E. A. Johnson

   Pages: 81 - 89

2. On formal quantum group laws

   • Ralf Holtkamp

   Pages: 90 - 103

3. A characterization of infinite 3-abelian groups

   • Alireza Abdollahi

   Pages: 104 - 108

4. t-closed rings of formal power series

   • Ali Benhissi

   Pages: 109 - 113

5. How often can a given distance occur in a finite set of integers?

   • Egbert Harzheim

   Pages: 114 - 118

6. A note on a theorem of Ljunggren and the Diophantine equations x2–kxy2 + y4 = 1, 4

   • Gary Walsh

   Pages: 119 - 125

7. Certain curves over Q (t) of genus 2, 3, 4

   • Andrew Bremner

   Pages: 126 - 131

8. Sur les tours localement cyclotomiques

   • Jean-François Jaulent
   • Florence Soriano

   Pages: 132 - 140

9. Funktionen, deren Maxima eine asymptotisch konstante Folge bilden

   • Irene Redheffer
   • Raymond Redheffer

   Pages: 141 - 145

10. The conditions that the product of Hankel operators is also a Hankel operator

    • Takashi Yoshino

    Pages: 146 - 153

11. A note about G-equivariant homotopies and isotopies, where G is a Lie group

    • Marja Kankaanrinta

    Pages: 154 - 160