another thing that is very closely related to the number e is the exponential function, usually denotes as e^x or exp(x). this function has very interesting properties for complex numbers (numbers which contain an “imaginary part” in addition to the real part, basically extending the numbers line with a second axis to cover a plane).
This function is at the heart of the famous equation e^i ^pi -1 = 0 and is very prominent through all of engineering and math. so many things where e pops up actually refer to the exponential function an not (directly) to the nunber itself.
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