I ran across a function and wondered if it's named. It reminds me of Lambert's W. I quote from my source (van de Lune and Wattel 1969):(adsbygoogle = window.adsbygoogle || []).push({});

where [itex]\xi[/itex] is the positive root of [itex]e^\xi-1=x\xi[/itex]

Here [itex]x[/itex] is a constant for our purposes.

The function is essentially logarithmic in the limit, as is clear from its definition.

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# Name this function!

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