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3.15 Special functions

R lambert_w0(T x)

Implementation of the $W_0$ branch of the Lambert W function, i.e., solution to the function $W_0(x) \exp^{ W_0(x)} = x$

R lambert_wm1(T x)
Implementation of the $W_{-1}$ branch of the Lambert W function, i.e., solution to the function $W_{-1}(x) \exp^{W_{-1}(x)} = x$