John Wallis
The life of John Wallis - the Infinity of Genius.
Wallis Product
An infinite product for \(\pi\) involving only rational numbers.
\[ \frac{\pi}{2} = \prod_{n=1}^\infty \left( \frac{2n}{2n-1} \cdot \frac{2n}{2n+1} \right) = \frac{2}{1} \cdot
\frac{2}{3} \cdot \frac{4}{3} \cdot \frac{4}{5} \dots \]
Sources: https://mathshistory.st-andrews.ac.uk/Biographies/Wallis/
