e, exp, EXP, natural number

2.718281828459045235360287…

1+1/1!+1/2!+1/3!+1/4!+1/5!+1/6!+…

limit of (1+1/n)n, taking n to infinity.

loge(e)=1, the base of natural log, ie, ln or loge

http://en.wikipedia.org/wiki/Exponential_function

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