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A direct proof of Kim’s identities

By R. J. Baxter


As a by-product of a finite-size Bethe ansatz calculation in statistical mechanics, Doochul Kim has established, by an indirect route, three mathematical identities rather similar to the conjugate modulus relations satisfied by the elliptic theta constants. However, they contain factors like 1 −q √ n and 1 −q n 2, instead of 1 −q n. We show here that there is a fourth relation that naturally completes the set, in much the same way that there are four relations for the four elliptic theta functions. We derive all of them directly by proving and using a specialization of Weierstrass ’ factorization theorem in complex variable theory

Year: 1998
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