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Operator-valued Riemann-Hilbert problem for correlation functions of the XXZ spin chain

Yasuhiro Fujii, Miki Wadati

cond-matarXiv:cond-mat/9910505

Abstract

The generating functional of correlation functions for the XXZ spin chain is considered in the thermodynamic limit. We derive a system of integro-difference equations that prescribe this functional. On the basis of this system we establish the operator-valued Riemann-Hilbert problem for correlation functions of the XXZ spin chain.

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