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Large induced trees in dense random graphs

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arxiv 2004.02800 v1 pith:PYPLMOK6 submitted 2020-04-06 math.CO

classification math.CO
keywords inducedsizearoundgraphshighlargeprobabilityrandom
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abstract

Erd\H{o}s and Palka initiated the study of the maximal size of induced trees in random graphs in 1983. They proved that for every fixed $0<p<1$ the size of a largest induced tree in $G_{n,p}$ is concentrated around $2\log_q (np)$ with high probability, where $q=(1-p)^{-1}$. De la Vega showed concentration around the same value for $p=C/n$ where $C$ is a large constant, and his proof also works for all larger $p$. We show that for any given tree $T$ with bounded maximum degree and of size $(2-o(1))\log_q(np)$, $G_{n,p}$ contains an induced copy of $T$ with high probability for $n^{-1/2}\ln^{10/9}n\leq p\leq 0.99$. This is asymptotically optimal.

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  1. Concentration of the maximum size of an induced subtree in moderately sparse random graphs

    math.CO 2025-06 conditional novelty 6.0 of 10

    For p = n^{-(e-2)/(3e-2)+ε}, the maximum induced tree size in G(n,p) is concentrated at two adjacent values.

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