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The   \section{Solving the sums, mathematical correct estimate} sum}  \subsection{Laws and forumulas of summation} 
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\item $\displaystyle\sum_{i=1}^n \frac{1}{i} = H_n$, where $H_n$ is the nth harmonic number.  \end{enumerate}  \subsection{Solving the sum} \subsection{Solving}  \begin{equation}  \begin{split}