Add explanation to readme

JSorngard · Jul 28, 2024 · 48a289d · 48a289d
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@@ -4,6 +4,8 @@ Fast evaluation of the principal and secondary branches of the [Lambert W functi
 
 This method uses a piecewise minimax rational approximation of the function.
 
+While the logarithm is the inverse of the function $f(w) = e^w$, the Lambert W function is the "inverse" of $f(w) = w*e^w$. Inverse in quotes because the Lambert W function in multi-valued.
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 This crate is a Rust port of the original Fortran 90 code by T. Fukushima.
 
 ## Examples