Increasing paths in regular trees

We consider a regular $n$-ary tree of height $h$, for which every vertex except the root is labelled with an independent and identically distributed continuous random variable. Taking motivation from a question in evolutionary biology, we consider the number of simple paths from the root to a leaf along vertices with increasing labels. We show that if $α= n/h$ is fixed and $α> 1/e$, the probability there exists such a path converges to 1 as $h \to \infty$. This complements a previously known result that the probability converges to 0 if $α\leq 1/e$.

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