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From: leox on 13 Jun 2010 08:26
How to simplify to a rational function the following sum

\sum x^i y^j z^{a*i+b*j-2k}

where a,b integers >0 and i,j,k>=0 run over the set a*i+b*j-2*k>=0?
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Prev: [] semi-Hamiltonian paths in planar triangulations
Next: where can i find math school programs for UK or USA?