Abstract
We prove that, when applied to square-lattice Ising models with 90° rotation symmetry, the renormalization-group transformation in the Kadanoff variational method with two variational parameters p 1 and p 2 breaks the 90° rotation symmetry if | p 1≠| p 2|. Thus it is inappropriate to apply this method to the spin model with 90° rotation symmetry, e.g. the Baxter model.
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