- #1

- 533

- 1

**Question about Taylor series and "big Oh" notation**

Can someone

**please**explain

**WHY**it's true that

[tex]

e^x = 1 + x + \frac{x^2}{2} + \mathcal{O}(x^3)

[/tex]

I'm somewhat familiar with "big Oh" notation and what it stands for, but I'm not quite sure why the above statement is true (or statements like it). Thanks!