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Mathematics Research Report MRR95-005

Remarks On The Quantum Dilogarithm

V.V. Bazhanov, N.Yu. Reshetikhin

Abstract: A quantum analog of the dilogarithm function has been introduced recently by Faddeev and Kashaev in such a way that certain identity in the Weyl algebra $\overline{W}_q$ plays the role of the five term dilogarithm identity. We study this identity in the limit when $q$ approaches a root of unity and show that it then reduces to the ``restricted star-triangle relation" which has been used previously by Bazhanov and Baxter as a local integrability condition of a class of three-dimensional solvable lattice models.


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