Sometimes I see or hear a reference to some kind of tree function in math, but every time I look it up, the term is so broad or vague that there's no consistent explanation of what it is or how it's used. Is there any kind of actual consensus on it? Because I have seen in occur in subjects ranging from the error function to graph theory to summations to properties of logarithms.
2026-03-25 17:24:58.1774459498
What is this "tree function" I see every once in a while?
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Perhaps you refer to something like this "Thus, the tree function T(z) is related to the W-Lambert function by T(z) = −W(−z)." from Euler Lambert and_the Lambert W-function today. This is in the context of graph theory used to enumerate labelled rooted trees as in the OEIS sequence A000169. The Lambert W function is related and has applications to logarithms and summation of series.