# How do you prove that the limit as p approaches infinity of i^p=delta where delta is the force of interest?

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How does one go about proving that the limit of i^p as p approaches infinity is equal to the force of interest?

Recall that the $$\lim\limits_{n \rightarrow \infty} (1 + \frac{x}{n})^n = e^x$$
By definition you also know that $$(1+i) = (1+\frac{i^(p)}{p})^p$$
therefore $$\lim\limits_{n \rightarrow \infty} (1 + \frac{i^(p)}{p})^p = e^{i(\infty)}$$
and so $$i^{\infty} = \delta$$