L n(x)=(e^x/n!)d^n/dx^n(x^n e^(-x))

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Theorem

The following formula holds: $$L_n(x) = \dfrac{e^x}{n!} \dfrac{d^n}{dx^n} (x^n e^{-x}),$$ where $L_n$ denotes Laguerre L and $e^x$ denotes the exponential function.

Proof

References