Ground State Structure of a Coupled 2-Fermion System in Supersymmetric   Quantum Mechanics
  We prove the uniqueness of the ground state for a supersymmetric quantum mechanical system of two fermions and two bosons, which is closely related to the N=1 WZ-model. The proof is constructive and gives detailed information on what the ground state looks like. 
Felix Finster (Harvard University, Department of Mathematics)