Zero-one laws for sparse random graphs

Zero-one laws for sparse random graphs
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DOI:
10.1090/s0894-0347-1988-0924703-8
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发表时间:
1988
影响因子:
3.9
通讯作者:
S. Shelah;J. Spencer
S. Shelah;J. Spencer
中科院分区:
数学1区
文献类型:
--
作者:
S. Shelah;J. Spencer

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对于随机图理论家(参见,例如,Bollobas [1]一般参考)p“任何常数”不是唯一的,甚至不是最有趣的情况。相反,他们考虑p = p(n),一个接近零的函数。在他们的开创性论文中,Erd 6s和Renyi [5]表明,对于许多有趣的A,存在一个函数p(n),他们称之为阈值函数,因此如果r(n)< p(n)则f(n,r(n),A)-+ 0,而如果p(n)< r(n)则f(n,r(n),A)1-+。(符号:p < r表示lim p/r = 0。所有极限都是当n接近无穷大时。)假设p = p(n)满足零一定律,如果对GRA中的所有A,limf(n,p,A)= 0或1。我们将部分描述满足零一定律的p = p(n)。
For random graph theorists (see, e.g., Bollobas [1] for general reference) p "any constant" is not the only, not even the most interesting case. Rather, they consider p = p(n), a function approaching zero. In their seminal paper, Erd6s and Renyi [5] showed that for many interesting A there is a function p(n), which they called a threshold function, so that if r(n) < p(n) then f(n, r(n), A) -+ 0 while if p(n) < r(n) then f(n, r(n), A) 1-+ . (Notation: p < r means lim p/r = 0. All limits are as n approaches infinity.) Let us say p = p(n) satisfies the Zero-One Law if for all A in GRA, limf(n, p, A) = 0 or 1. We shall partially characterize those p = p(n) which satisfy the Zero-One Law.