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Integrable deformations of CFTs and the discrete Hirota equations

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arxiv 0905.3776 v2 pith:IJIGQ5AF submitted 2009-05-24 hep-th

classification hep-th
keywords knowndiscreteequationshirotarangessecondsolutionsvariable
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abstract

We solve the discrete Hirota equations (Kirillov-Reshetikhin Q-systems) for $A_r$, and their analogue for $D_r$, for the cases where the second variable ranges over either a finite set or over all integers. Until now only special solutions were known. We find all solutions for which no component vanishes, as required in the known applications. As an introduction we present the known solution where the second variable ranges over the natural numbers.

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    Every 2-periodic positive real mesh frieze of finite type A, D or E is constant, or lies in a one- or two-parameter family, with the exact count depending on the type.

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