*This article is about double exponential functions. For the double exponential distribution, see Laplace distribution.*

A

**double exponential**function is a constant raised to the power of an exponential function. The general formula is , which grows even faster than an exponential function. For example, if

*a*=

*b*= 10:

Factorials grow faster than exponential functions, but much slower than double-exponential functions. Compare the hyper-exponential function, which grows even faster.

*f*(−1) ≈ 1.26

*f*(0) = 10

*f*(1) = 10 = googolplex

**Applications**

Ackermann function

Big O notation

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