A. Procacci et al., A REMARK ON HIGH-TEMPERATURE POLYMER EXPANSION FOR LATTICE SYSTEMS WITH INFINITE-RANGE PAIR INTERACTIONS, letters in mathematical physics, 45(4), 1998, pp. 303-322
We consider the standard high temperature-small activity polymer expan
sion for lattice spin systems and show how, in many cases using a tree
graph equality, various classical results may be improved in some cas
es or at least proved in a much simpler way.