Can someone please show me how the formula(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\sum^{∞}_{0}\frac{u^{x}}{x!} = e^{u}[/itex]

Is derived?

Or link me to an explanation.

Thanks!

http://www.wolframalpha.com/input/?i=sum+of+%28%28a%5Ex%29%2F%28%28x%29%21%29%29+from+x%3D0+to+x+%3D+inf

(Just to show you what I'm talking about)

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# Proving that the sum of (u^x)/x! from 0 to infinity = e^u

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