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