this is the value of e e (mathematical constant) The number e is an important mathematical constant that is the base of the natural logarithm . It is approximately equal to 2.71828, [1] and is the limit of (1 + 1/ n ) n as n approaches infinity, an expression that arises in the study of compound interest . It can also be calculated as the sum of the infinite series [2] The constant can be defined in many ways; for example, e is the unique real number such that the value of the derivative (slope of the tangent line ) of the function f ( x ) = e x at the point x = 0 is equal to 1. [3] The function e x so defined is called the exponential function , and its inverse is the natural logarithm , or logarithm to base e . The natural logarithm of a positive number k ...
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