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Line 18:
Line 18: − +
→Description
<math>^n{a} =
<math>^n{a} =
\begin{cases}
\begin{cases}
1, & \mbox{if }n\mbox{ =0} \\
a^{a^{(n-1)}}, & \mbox{if }n\mbox{ >0}
\end{cases}</math>
\end{cases}</math>