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arXiv 1304.2016math.PRmath.CO
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$G(n,p)$中一类随机定向问题的第一临界概率

First critical probability for a problem on random orientations in $G(n,p)$

Sven Erick Alm, Svante Janson, Svante Linusson

摘要:

研究了具有随机方向的随机图$G(n,p)$.对于$G(n,p)$中的三个固定顶点$s,a,b$,我们研究了事件$a \to s$和$s\to b$的相关性。我们证明,渐近的相关性是负的小$p$,$p<\frac{C_1}n$,其中$C_1\approx0.3617$,积极的$\frac{C_1}n<p<\frac2n$和高达$p=p_2(n)$。计算机辅助计算表明,$p_2(n)=\frac{C_2}n$,与$C_2\approx7.5$。我们推测,$p$的相关性保持为负,直到先前已知的$\frac12$为零;对于较大的$p$,它是正的。

英文摘要:

We study the random graph $G(n,p)$ with a random orientation. For three fixed vertices $s,a,b$ in $G(n,p)$ we study the correlation of the events $a \to s$ and $s\to b$. We prove that asymptotically the correlation is negative for small $p$, $p<\frac{C_1}n$, where $C_1\approx0.3617$, positive for $\frac{C_1}n<p<\frac2n$ and up to $p=p_2(n)$. Computer aided computations suggest that $p_2(n)=\frac{C_2}n$, with $C_2\approx7.5$. We conjecture that the correlation then stays negative for $p$ up to the previously known zero at $\frac12$; for larger $p$ it is positive.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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