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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...
Thanks for the tip.     Although from the first example in ref/If the If[] should work, Mathematica seems happier with Piecewise[].    Then I was advised to "rationalize" the decimal fractions in the equations, which in this case was easy to do (e.g....