SPIN MODELS CORRESPONDING TO NONSYMMETRIC ASSOCIATION SCHEMES OF CLASS 2
1993 年 47 巻 2 号 p. 383-390
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1993 年 47 巻 2 号 p. 383-390
In [6] Yasuo Watatani and Akihiro Munemasa found an example of a nonsymmetric spin model on 3 vertices. In this paper we show that there are no spin models corresponding to nonsymmetric association schemes of class 2 except the ones corresponding to Potts models and the one on three vertices.
