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System of cross-polynomials of variable degree

  1. Mar 4, 2013 #1
    Dear all,

    I am stuck with an apparently easy system of 3 simultaneous equations that has to be solved in x,y and z. The system is the following:

    (y+z)/((x+y+z)²)=ax^{α-1}
    (x+z)/((x+y+z)²)=by^{α-1}
    (x+y)/((x+y+z)²)=cz^{α-1}

    The parameters (a,b,c) and the variables (x,y,z) are all in ℝ₊. The parameter α is in the open interval (0,1), so that the problem is not trivial. The question is for which α there exists a closed-form solution, and for which α there exists none, given a general vector (a,b,c).

    Proving that there always exist a unique solution is trivial as in each equation the right-hand sides are always increasing, whereas the left-hand sides are always decreasing in the corresponding variable (x for the first, y for the second, z for the third).

    Hence, my problem is in the existence of a closed-form solution.

    Many thanks!!
     
  2. jcsd
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