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# What is e?

e is the base of the natural logarithm, a fundamental constant. It is an irrational number approximately equal to 2.7181281828459..
e is the most important constant in mathem…atics. It is transcendental, meaning it is not a root of any polynomial with integer coefficients..
It is defined as 1 + 1 + 1/2! + 1/3! + 1/4! + . . ..
e can also be defined as the limit of (1+1/n)^n as n goes to infinity. (MORE)