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I need to have a LogErfc function to be able to compute another function in a numerically stable manner. I found the function in the GSL, I found it in R, and even in another system, there's a copy of code to do it floating around. However, I need it in Mathematica and Log[Erfc[x]] doesn't cut in due to underflow. Cody solved this in 1969, and I could code his solution, but I was hoping that someone had already solved this in Mathematica. Anyone?