Euler's identity

Thanks to Swiss mathematician Leonhard Euler, some said this is the greatest mathematical theorem. The formula contains many key elements in math: real number, imaginary unit, addition, multiplication, and exponentiation. This is amazing. I wish I knew more about math to appreciate the beauty of the equation.

Here, first we have the Euler’s number e:

Then the imaginary unit i:

The last, we have pi:

And the Euler’s Formula states:

or more commonly expressed as: