1. Obituary: Mark Kac (1914–1984)

   Announcement Pages: 453 - 453

2. A proof of the indeterminary relation of lifetime and energy

   • Marian Grabowski

   OriginalPaper Pages: 455 - 458

3. Noncontractible hyperloops in gauge models with Higgs fields in the fundamental representation

   • Jürgen Burzlaff

   OriginalPaper Pages: 459 - 465

4. The Poincare-Dulac theorem for nonlinear representations of nilpotent lie algebras

   • Didier Arnal
   • Mabrouk Ben Ammar
   • Georges Pinczon

   OriginalPaper Pages: 467 - 476

5. The Zitterbewegung of the neutrino

   • A. O. Barut
   • A. J. Bracken
   • W. D. Thacker

   OriginalPaper Pages: 477 - 482

6. Deformation theory applied to quantization and statistical mechanics

   • H. Basart
   • M. Flato
   • D. Sternheimer

   OriginalPaper Pages: 483 - 494

7. Phase and number

   • A. Galindo

   OriginalPaper Pages: 495 - 500

8. Automorphisms that commute with a modular automorphism

   • heide Narnhofer

   OriginalPaper Pages: 501 - 506

9. Gauge fixing and massless, integral-spin fields in de sitter space

   • Jean-Pierre Gazeau

   OriginalPaper Pages: 507 - 516

10. Completeness of wave operators in relativistic quantum mechanics

    • A. Soffer

    OriginalPaper Pages: 517 - 527

11. Some remarks on the differential approach to the star-triangle relation

    • Michio Jimbo
    • Tetsuji Miwa

    OriginalPaper Pages: 529 - 534

12. Stochastic quantization, supersymmetry and the Nicolai map

    • P. H. Damgaard
    • K. Tsokos

    OriginalPaper Pages: 535 - 540

13. Errata

    Erratum Pages: 541 - 541