Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-11-10
J.Statist.Phys. 108 (2002) 1-48
Physics
Condensed Matter
Statistical Mechanics
40 pages, no figures
Scientific paper
We discuss some of the difficulties that have been mentioned in the literature in connection with the Bethe ansatz for the six-vertex model and XXZ chain, and for the eight-vertex model. In particular we discuss the ``beyond the equator'', infinite momenta and exact complete string problems. We show how they can be overcome and conclude that the coordinate Bethe ansatz does indeed give a complete set of states, as expected.
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