Degenerations of Ruijsenaars-van Diejen operator and q-Painleve   equations
  It is known that the Painleve VI is obtained by connection preserving deformation of some linear differential equations, and the Heun equation is obtained by a specialization of the linear differential equations. We inverstigate degenerations of the Ruijsenaars-van Diejen difference opearators and show difference analogues of the Painleve-Heun correspondence. 
Kouichi Takemura
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