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p_0,\ldots,p_{n-1}
\log_a n=\Theta (\log_b n)
\log_a n=\frac{1}{\log_b a}\times \log_b n
\log_a n=\frac{\log_b n}{\log_b a}
{\rm Ack}(m,n)=\begin{cases} n+1, & \mbox{if}~m=0\\ {\rm Ack}(m-1,1), & \mbox{if}~n=0\\ {\rm Ack}(m-1,{\rm Ack}(m, n-1)), & \mbox{otherwise}\\ \end{cases}