Limits on the Domain of Coupling Constants for Binding N-Body Systems   with No Bound Subsystems
  We study the domain of coupling constants for which a 3-body or 4-body system is bound while none of its subsystems is bound. Limits on the size of the domain are derived from a variant of the Hall--Post inequalities which relate $N$-body to $(N-1)$-body energies at given coupling. Possible applications to halo nuclei and hypernuclei are briefly outlined. 
Jean-Marc Richard (Grenoble) and Sonia Fleck (Lyon, France)