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    • A Lyness equation for graphs 

      Northshield, Sam (Journal of Difference Equations and Applications, 2012)
      The Lyness equation, x(n+1)=(x(n)+k)/x(n-1), can be though of as an equation defined on the 2-regular tree T2: we can think of every vertex of T2 as a variable so that if x and z are the vertices adjacent to y, then x,y,z ...