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Message: hmmmm to the nth power, i mean e

http://www.britannica.com/EBchecked/topic/195201/Leonhard-Euler

excerpt below, seriously, plank doesn't make this up!

He introduced many current notations, such as Σ for the sum; ∫n for the sum of divisors of n; the symbol e for the base of natural logarithms;

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