SMALL BETA-EXPANSION FOR INFINITE CHAIN LIMIT OF ONE-DIMENSIONAL HUBBARD-MODEL

The one dimensional Hubbard model can be solved exactly. In the limit N --> infinity, the energy per particle remains finite and can be expr essed as an integral. The small beta expansion in this limit is invest igated. Several elementary derivations are presented as well as a simp le formula which can be used to generate both small and large beta exp ansions.