Learn about e!

Feb 7, 2021 | Kerrisdale

You know about Pi day, but did you know that today is e day?

That's right! February 7 (2.7) is a day to celebrate Euler’s number, also written as e. Named after mathematician Leonhard Euler used to model exponential growth, and is the base for the natural logarithm.

Graph of ln(x)

The best part is, you can calculate it at home!

Euler’s number is the sum to infinity of the reciprocal of n! where n goes from 1 to infinity.

So what does that mean?

e= 1 + (1 / 1) + (1 / 2x1) + (1 / 3x2x1) + (1 / 4x3x2x1) +...
Or, in other words,
e = 1+ 1 + 1/2 + 1/6 + 1/12 + …

On and on until infinity!

If you don’t have the patience for all that addition though, the first 10 digits of euler’s number are:

2.718281828

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