On two-parameter solutions of simultaneous ultradiscrete Painleve II   equation with parity variables
  We introduce a simultaneous ultradiscrete Painleve II equation with parity variables, which is shown to be more suitable for studying two-parameter solutions than the single second-order ultradiscrete Painleve II equation with parity variables. We investigate several types of two-parameter solutions and the solutions which are related with the ultradiscrete limit of determinant type solutions of q-Painleve II equation. 
Hikaru Igarashi and Kouichi Takemura
math.CA math-ph math.MP