mzuenni tests

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diff --git a/content/math/tables/series.tex b/content/math/tables/series.tex
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+\begin{tabularx}{\linewidth}{|XIXIXIX|}
+	\hline
+	\multicolumn{4}{|c|}{Reihen} \\
+	\hline
+	$\sum\limits_{i = 1}^n i = \frac{n(n+1)}{2}$ &
+	$\sum\limits_{i = 1}^n i^2 = \frac{n(n + 1)(2n + 1)}{6}$ &
+	$\sum\limits_{i = 1}^n i^3 = \frac{n^2 (n + 1)^2}{4}$ &
+	$H_n = \sum\limits_{i = 1}^n \frac{1}{i}$ \\
+	\grayhline
+	
+	$\sum\limits_{i = 0}^n c^i = \frac{c^{n + 1} - 1}{c - 1} \quad c \neq 1$ &	
+	$\sum\limits_{i = 0}^\infty c^i = \frac{1}{1 - c} \quad \vert c \vert < 1$ &
+	$\sum\limits_{i = 1}^\infty c^i = \frac{c}{1 - c} \quad \vert c \vert < 1$ &	
+	$\sum\limits_{i = 0}^\infty ic^i = \frac{c}{(1 - c)^2} \quad \vert c \vert < 1$ \\
+	\grayhline
+	
+	\multicolumn{2}{|lI}{
+		$\sum\limits_{i = 0}^n ic^i = \frac{nc^{n + 2} - (n + 1)c^{n + 1} + c}{(c - 1)^2} \quad c \neq 1$
+	} &	
+	\multicolumn{2}{l|}{
+		$\sum\limits_{i = 1}^n iH_i = \frac{n(n + 1)}{2}H_n - \frac{n(n - 1)}{4}$
+	} \\
+	\grayhline
+	
+	\multicolumn{2}{|lI}{
+		$\sum\limits_{i = 1}^n H_i = (n + 1)H_n - n$
+	} &
+	\multicolumn{2}{l|}{
+		$\sum\limits_{i = 1}^n \binom{i}{m}H_i =
+		\binom{n + 1}{m + 1} \left(H_{n + 1} - \frac{1}{m  + 1}\right)$
+	} \\
+	\hline
+\end{tabularx}