Periodicity of Y-systems

수학노트
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introduction

  • periodicity (Keller) : <math>Y_{\mathbf{i}}(u+2(h+h'))=Y_{\mathbf{i}}(u)</math>
  • half-periodicity : <math>Y_{\mathbf{i}}(u+(h+h'))=Y_{\sigma(\mathbf{i})}(u)</math> where <math>\sigma</math> is the involution of the pair of Dynkin diagram


expositions


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