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Who has not be amazed to learn that the function y = ex, like a phoenix rising again from its own ashes, is its own derivative?
—Francois le Lionnais

An exponential is anything that grows at a rate proportional to its size is said to grow exponentially. The simplest form of the exponential function is just y = ex, where e is about 2.712... The exponential function to base a can be written as f(x) = ax. See also exponent.

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