1. A note on the diophantine equation x² + 1 = dy⁴

   • Chen Jian Hua

   OriginalPaper Pages: 1 - 10

2. On sums of two units

   • J. Kostra

   OriginalPaper Pages: 11 - 14

3. Exakte graphen

   • R. Schnabel
   • U. Spengler

   OriginalPaper Pages: 15 - 31

4. Chain spaces over Jordan systems

   • A. Blunck

   OriginalPaper Pages: 33 - 49

5. An arithmetic Hurwitz formula

   • Q. V. Pham

   OriginalPaper Pages: 51 - 58

6. Two aspects of log terminal surface singularities

   • R. Blache

   OriginalPaper Pages: 59 - 87

7. On thek-spannedness of the adjoint line bundle for degree ≤4k+4

   • E. Ballico
   • M. Beltrametti

   OriginalPaper Pages: 89 - 96

8. Double covers of smooth hyperquadrics as ample and very ample divisors

   • A. Lanteri

   OriginalPaper Pages: 97 - 103

9. On vandiver’s conjecture

   • S. Jakubec

   OriginalPaper Pages: 105 - 124

10. Eine klasse von graphen, in der Jeder toleranzgraph ein beschrankter toleranzgraph ist

    • A. Parra

    OriginalPaper Pages: 125 - 129

11. An extension of whitney’s theorem to infinite strong triangulations

    • H. O. Jung

    OriginalPaper Pages: 131 - 139

12. One-way infinite hamiltonian paths in infinite maximal planar graphs

    • H. -O. Jung

    OriginalPaper Pages: 141 - 150

13. Cayley, Marty and Schreier hypergraphs

    • M. Buratti

    OriginalPaper Pages: 151 - 162

14. Hopf Manifolds and Vector Bundles on projective spaces

    • D. Mall

    OriginalPaper Pages: 163 - 166

15. The classification of the simple modular lie algebras: V. algebras with Hamiltonian two-sections

    • H. Strade

    OriginalPaper Pages: 167 - 202

16. A functional equation of abel revisited

    • M. Sablik

    OriginalPaper Pages: 203 - 210

17. Vector valued theta series and waldspurger’s theorem

    • S. Böcherer
    • R. Schulze-Pillot

    OriginalPaper Pages: 211 - 233

18. Integral bases and fundamental units of the cubic fieldsQ(w) defined by W³ + AW - 1 = 0defined by W³ + AW - 1 = 0

    • A. Takaku
    • S. -I. Yoshimoto

    OriginalPaper Pages: 235 - 247

19. On fano 3-folds with non-rational singularities and two-dimensional base

    • S. Ishii

    OriginalPaper Pages: 249 - 277

20. Spheres of quadratic field extensions

    • H. Havlicek

    OriginalPaper Pages: 279 - 292

21. Über eine klasse 2-adischer funktionen im zusammenhang mit dem „3X + 1“-problem

    • H. Müller

    OriginalPaper Pages: 293 - 302

22. On minkowski planes with transitive groups of homotheties

    • M. Klein
    • H. -J. Kroll

    OriginalPaper Pages: 303 - 313