deletions | additions       diff --git a/stuff.tex b/stuff.tex  index 66eb09b..b6c75a4 100644  --- a/stuff.tex  +++ b/stuff.tex 
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\item $\displaystyle\sum_{n=s}^t f(n) - \sum_{n=s}^{t} g(n) = \sum_{n=s}^t \left[f(n) - g(n)\right]$  \item $\displaystyle\sum_{i=m}^n 1 = \n - m + 1$  \item $\displaystyle\sum_{i=1}^n \frac{1}{i} = H_n$  \item $\displaystyle\lim_{x \to +\infty} H_x +\infty}\left[H_x\right]  = ln x$ \end{enumerate}  \begin{equation}