Dima Ioffe,Senya Shlosman,Yvan Velenik
2D models of statistical physics with continuous symmetry: the case of 
singular interactions
(76K, latex2e)

ABSTRACT.  We show the absence of continuous symmetry breaking in 2D lattice systems 
without any smoothness assumptions on the interaction. We treat certain cases 
of interactions with integrable singularities. We also present cases of 
singular interactions with continuous symmetry, when the symmetry is broken in 
the thermodynamic limit.