Double exponential may refer to: A double exponential function Double exponential time, a task with time complexity roughly proportional to such a function 2-EXPTIME, the complexity class of decision problems solvable in double-exponential time by a deterministic Turing machine. Double exponential distribution, which may refer to: Laplace distribution, a bilateral exponential distribution Gumbel distribution, an iterated exponential distribution Double exponential integration, most commonly tanh-sinh quadrature Double exponential smoothing