User:Azursmile/sandbox/bernoulli euler number

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 * let $$p = -n-1$$


 * $$e= \lim_{n \to \infty}\left (1+ \frac{1}{n} \right )^n = \lim_{p \to -\infty}\left (1- \frac{1}{p+1} \right )^{-(p+1)}$$