Lambert W of Zero is Zero
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Theorem
Let $W_0$ denote principal branch of the Lambert W function.
Then:
- $W_0 \left({0}\right) = 0$
Proof
From the definition of the principal branch of the Lambert W function:
- $y = W_0 \left({x}\right) \iff x = y e^y$
where $x \in \left[{-\dfrac 1 e \,.\,.\, \to}\right)$ and $y \in \left[{-1 \,.\,.\, \to}\right)$.
The result follows from substituting $x = 0$ and $y = 0$.
$\blacksquare$