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Fast evaluation of the real valued parts of the principal and secondary branches of the [Lambert W function](https://en.wikipedia.org/wiki/Lambert_W_function) using the [method of Toshio Fukushima](https://www.researchgate.net/publication/346309410_Precise_and_fast_computation_of_Lambert_W_function_by_piecewise_minimax_rational_function_approximation_with_variable_transformation) to either 24 or 50 bits of accuracy.
This method uses a piecewise minimax rational approximation of the function.
This method uses a piecewise minimax rational function approximation.
