1. The problem statement, all variables and given/known data Incoming signal has normal distribution, xmin is equal to -sigma, xman is equal to +sigma. What is the governing equation of the nonlinearity through which the signal has to be passed in order to make its pdf uniform? 2. Relevant equations http://en.wikipedia.org/wiki/Normal_distribution 3. The attempt at a solution I have already found out that the signal needs to be passed through erf(x/sqrt(2)), which is very relevant to the CDF of normal distribution. The problem is that I cannot find a mathematical proof.