1. On the quantum logic approach to quantum mechanics

   • S. Gudder

   OriginalPaper Pages: 1 - 15

2. Construction de solutions radiatives approchées des equations d'Einstein

   • Y. Choquet-Bruhat

   OriginalPaper Pages: 16 - 35

3. Properties of crystal states

   • H. J. F. Knops

   OriginalPaper Pages: 36 - 42

4. On the product form of quasi-free states

   • J. Manuceau
   • F. Rocca
   • D. Testard

   OriginalPaper Pages: 43 - 57

5. On the spectrum of internal symmetries in the algebraic quantum field theory

   • A. Z. Jadczyk

   OriginalPaper Pages: 58 - 63

6. Group-theoretical foundations of classical mechanics: The Lagrangian gauge problem

   • Jean-Marc Lévy-Leblond

   OriginalPaper Pages: 64 - 79

7. Symmetries induced by conserved vector currents in the theory of a scalar field

   • Jan T. Łopuszański

   OriginalPaper Pages: 80 - 90