Robuta

https://functions.wolfram.com/GammaBetaErf/Erfc/19/02/0001/ Complementary error function: Complex characteristics (formula 06.27.19.0004) Complex characteristics complementary error function complex characteristics formula https://functions.wolfram.com/GammaBetaErf/InverseErfc/06/01/02/0003/ Inverse complementary error function: Series representations (formula 06.31.06.0006) Series representations complementary error function inverse series representations formula