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    A Lyness equation for graphs

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    Author
    Northshield, Sam
    Keyword
    difference equation
    graph
    invariant
    periodicity
    Date Published
    2012
    
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    URI
    http://hdl.handle.net/20.500.12648/1114
    Abstract
    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 satisfy xz=y+k. This makes sense for any 2-regular graph. We generalize this to 3-regular graphs by considering xyz=w+k and xy+xz+yz=w+k where x,y,z are the three neighbors of w. In the special case where an auxiliary condition x+y+z=f(w) also hold, a solutions is determined by (any) two values and, in some cases, an invariant can be found.
    Citation
    Northshield, S. (2012). A Lyness equation for graphs. Journal of Difference Equations and Applications, 18(7), 1183-1191. http://doi.org/10.1080/10236198.2011.556629
    Description
    This article has been published in 2011 in the Journal of Difference Equations and Applications.
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