Abstract
We study 2 2m atricesA such that the corresponding thermodynamic Bethe ansatz (TBA)equationsyieldcâAaintheformoftheeffective centralchargeofaminimalVirasoro model. Certain properties of such matrices and the corresponding solutions of theTBA equations are established. Several continuous families and a discrete set of admissible matrices A are found. The corresponding two-term dilogarithm identities (some of which appear to be new) are obtained. Most of them are proven or shown to be equivalent to previously known identities.
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