Quantum mechanics in a cut Fock space
  A recently introduced numerical approach to quantum systems is analyzed. The basis of a Fock space is restricted and represented in an algebraic program. Convergence with increasing size of basis is proved and the difference between discrete and continuous spectrum is stressed. In particular a new scaling low for nonlocalized states is obtained. Exact solutions for several cases as well as general properties of the method are given. 
Maciej Trzetrzelewski (M. Smoluchowski Institute of Physics,   Jagellonian University, Krakow, Poland)