Oscar Bolina, Pierluigi Contucci, Bruno Nachtergaele
Path Integral Representations for the Spin-Pinned Quantum XXZ Chain 
(51K, Latex)

ABSTRACT.  Two discrete path integral formulations for the ground state of 
a spin-pinned quantum anisotropic XXZ Heisenberg chain are introduced. Their properties are discussed and two recursion relations are proved.