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$$\large{\displaylines{\normalsize\begin{array}{c|l} 1 & \displaystyle{\color{#ff7800}\frac{\pi}{4}}=1-\frac{1}{3}+\frac{1}{5}-\frac{1}{7}+\ldots\\ \\ 2 & \displaystyle{\color{#ff7800}\ln{2}}=1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+\ldots\\ \\ 3 & \displaystyle{\color{#ff7800}e}=\frac{1}{0!}+\frac{1}{1!}+\frac{1}{2!}+\ldots \end{array}}}$$

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