system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is 2.71828183 so important it's known as e and not just 2.71828183?

Like, why 2.71828183 as opposed to 4.5549867549867837432?
gpt
It so happens that **e** is very important in trigonometry, probability, statistics, and differential calculus.  It's also not 2.71828183 -- it's actually an irrational and transcendental number, like pi.

Why is **e** so important?  That's hard to explain in LI5 terms.  But it shows up everywhere, kind of like pi.

One of the more famous equations in mathematics is this one:

**e^(i * pi) + 1 = 0**

This relates the 5 most important constants (e, i, pi, 1, and 0) in a single equation.