- lim for all real x.
- \displaystyle e^x = \sum_{n=0}^{\infty}
\frac{x^n}{n!} for all real x.
- \displaystyle e = \sum_{n=0}^{\infty} \frac{1}{n!}
- The Binomial Series:
If k is any real number and |x|< 1, then
\displaystyle (1+x)^k = \sum_{n=0}^{\infty}{k \choose
n}\, x^n = 1 + kx + \frac{k(k-1)}{2!}x^2 +
\frac{k(k-1)(k-2)}{3!}x^3 + \ldots
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