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The Mathematica function RSolve has limitations on the form of recurrence formulas that it will handle (these limitatiions seem to give rise to many similar questions on this discussion group). What existing parts of Mathematica...
[b]Solve::svars: Equations may not give solutions for all "solve" variables. This message is generated when the number of variables listed in the second argument of Solve is greater than the number of variables that could be determined from the...