LESSON Reteach 27-6 2 The Natural Base, e

ln e 1 e ln x x Reteach The Natural Base, e The natural logarithmic function, f x ln x, is the inverse of the exponential function with the natural base e, f x e x. The constant e is an irrational number. e 2.71828…. Properties of logarithms apply to the natural logarithm. In particular: ln 1 0 The base is e and e 0 1. ln e 1 Think: e 1 e.


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