Also equal to the sum as n goes from zero to infinity of 1 over n factorial is, for ten points, what transcendental number, the base of natural logarithms?
This number is closely related to solutions of the equation "derivative of y with respect to x equals y" and is equal to the limit as x goes to 0 of the quantity 1 plus x all raised to the power one over x.  Also equal to the sum as n goes from zero to infinity of 1 over n factorial is, for ten points, what transcendental number, the base of natural logarithms?
This number is closely related to solutions of the equation "derivative of y with respect to x equals y" and is equal to the limit as x goes to 0 of the quantity 1 plus x all raised to the power one over x.  
{e} or {Euler's number}