1. On necessary and sufficient conditions for the existence of time and entropy operators in quantum mechanics

   • Maurice Courbage

   OriginalPaper Pages: 425 - 432

2. Passive states for finite classical systems

   • J. Górecki
   • W. Pusz

   OriginalPaper Pages: 433 - 443

3. Explicit solutions to two-dimensionalized Volterra equations

   • A. N. Leznov
   • M. V. Saveliev
   • V. G. Smirnov

   OriginalPaper Pages: 445 - 449

4. On the geometric origin of the equation ϕ,11 — ϕ,22 = e^ϕ — e^-2ϕ

   • V. V. Nesterenko

   OriginalPaper Pages: 451 - 456

5. Stochastic variational problems with constraints

   • J. -C. Zambrini

   OriginalPaper Pages: 457 - 463

6. Euclidean electromagnetic field as Ito's random current: a simple proof of Markov property

   • S. C. Lim

   BriefCommunication Pages: 465 - 467

7. Some remarkableR-separable coordinate systems for the Helmholtz equation

   • E. G. Kalnins
   • W. Miller Jr

   OriginalPaper Pages: 469 - 474

8. Generalized stochastic mechanics on Riemannian manifolds

   • Mark Davidson

   OriginalPaper Pages: 475 - 483

9. Hamiltonian structure of isospectral deformation equation and semi-classical approximation to factorizedS-matrices

   • D. V. Chudnovsky
   • G. V. Chudnovsky

   OriginalPaper Pages: 485 - 493

10. Antibound states for a class of one-dimensional Schrödinger operators

    • A. Angeletti

    OriginalPaper Pages: 495 - 504

11. On Witten's charge formula

    • Abdus Salam
    • J. Strathdee

    OriginalPaper Pages: 505 - 508

12. Ultrageneralised complex analysis

    • Patrick J. McCarthy

    OriginalPaper Pages: 509 - 514

13. On the structure of gauge invariant classical observables in lattice gauge theories

    • B. Durhuus

    OriginalPaper Pages: 515 - 522

14. Erratum

    Erratum Pages: 523 - 523