The nameterm "functional equation" is used for problems where the goal is to find all functions satisfying the given equation (and maybe someand possibly other conditions). So in this case, solvingSolving the equation means finding all functions fulfilling the equation. (This is different from the more common use ofsatisfying the word equation, where the solutions are numbers.) For basic questions about functions use more suitable tags like (functions) or (elementary-set-theory).
Added clarification about "functional". Added differentiation technique. Sharpened terminology.
Adrian Keister
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J. M. ain't a mathematician
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Martin Sleziak
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