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<math display=block>f\bigl(f(x)\bigr) = ab^x,</math>
for some constants {{nowrap|<math>a</math> and <math>b</math>.}}
[[Hellmuth Kneser]] first proposed a [[holomorphic function|holomorphic]] construction of the solution of <math>f\bigl(f(x)\bigr) = e^x</math> in 1950. It is closely related to the problem of extending [[tetration]] to non-integer values; the value of <math>{}^\frac{1}{2} a</math> can be understood as the value of <math>f\bigl(1)</math>, where <math>f\bigl(x)</math> satisfies <math>f\bigl(f(x)\bigr) = a^x</math>.
==Impossibility of a closed-form formula==
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