Baxter's book - "Exactly Solved Models in Statistical Mechanics"
by Jan de Gier
Abstract: I will discuss explicit solutions to the integral equations for the largest eigenvalue of the transfer matrix that resulted from the Bethe Ansatz in the thermodynamic limit. In particular we will compute the residual entropy of square ice (i.e. the number of ways to place arrows on the square lattice satisfying the ice rule). The solution will depend non-analytically on the anisotropy parameter $\Delta$, giving rise to a non-trivial phase diagram. We'll cover sections 8.8 of Baxter's book.
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