1. Quasi-equivalence of quasi-free states on the Weyl algebra

   • A. Van Daele

   OriginalPaper Pages: 171 - 191

2. Hamiltonians defined as quadratic forms

   • Barry Simon

   OriginalPaper Pages: 192 - 210

3. New elliptic system and global solutions for the constraints equations in General relativity

   • Yvonne Choquet-Bruhat

   OriginalPaper Pages: 211 - 218

4. Galilean invariant Lee model for all spins and parities

   • C. R. Hagen

   OriginalPaper Pages: 219 - 236

5. Gauge invariance and the generalized Bondi-Metzner algebra

   • Mayer Humi

   OriginalPaper Pages: 237 - 243

6. A general class of quantum fields without cut-offs in two space-time dimensions

   • Raphael Høegh-Krohn

   OriginalPaper Pages: 244 - 255

7. On the spectrum of the space cut-off :P(ϕ):Hamiltonian in two space-time dimensions

   • Raphael Høegh-Krohn

   OriginalPaper Pages: 256 - 260