The Gaussian Integral aka Euler–Poisson IntegralAbraham de Moivre originally discovered this type of integral in 1733, while Gauss published the precise integral in 1809. The integral has a wide range of applications. For example, with a slight change of variables it is used to compute the normalizing constant of the normal distribution.The same integral with finite limits is closely related to both the error function and the cumulative distribution function of the normal distribution.In physics