The Grapes of Math
The Grapes of Math How Life Reflects Numbers and Numbers Reflect Life By Bellos, Alex Book - 2014

OMG!!! LOL!!! It turns out that if we calculate 1/n! for every number starting from 0, then add up all the terms, the answer is e.
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Euler’s identity is the “To be or not to be” of mathematics, the most famous line in the oeuvre and a piece of cultural heritage that resonates beyond its field: e^iπ + 1 = 0
...The equation is mind-blowing. It cleanly unites the five most important numbers in math: 1, the first counting number; 0, the abstraction of nothing; π, the ratio of a circle’s circumference to its diameter; e, the exponential constant; and i, the square root of minus one.

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