DOC: special: Show that lambertw can solve x = a + b*exp(c*x) #17268
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This expands the "applications to equation-solving" examples in the
lambertw
docstring. The function can be used to solve the implicit equationx = a + b*exp(c*x)
.A "real world" application of this is solving the Colebrook equation. I didn't mention that in the docstring, as it involves too much specialized notation.