e, or Euler’s Number, is an irrational number, a constant, just like π! Euler’s number is defined as 2.718… The three dots mean that the number goes on forever without a pattern, and never ends. But that begs the question, what is it’s purpose? Well, e’s purpose is more complex than that of π. It has to do with continuously compounding growth and decay and interest. Financers use it the most frequently. What’s really cool is the formula for it.

Where n is any real number. What this fancy equation is saying is if you put any number in for n in that equation, it gets closer and closer to e, but never reaches it on the graph. It never touches the green line. Go ahead, try it and see for yourself!

Watch this Numberphile video to learn more about e!

Good info! Many people who actually work with e don’t know what it is. Love the video!

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