不含两条不可比较长链的偏序集上首次拟合的一个改进界
An Improved Bound for First-Fit on Posets Without Two Long Incomparable Chains
摘要:
已知的是,用于将偏序集P划分成链的First-Fit算法在P没有两个大小为k的不可比链时使用相对较少的链。特别地,如果P具有宽度w,则Bosek、Krawczyk和Szczypka(SIAM J. Discrete Math.,23(4):1992- 1999,2010)证明了ckw^{2}在某个常数c下的第一拟合所用链数的上界,而乔雷特和米兰斯(Order,28(3):455- 464,2011)给出了ck^{2}w的一个上界。本文证明了ckw形式的一个上界。这是最好的可能,直到c的值。
英文摘要:
It is known that the First-Fit algorithm for partitioning a poset P into chains uses relatively few chains when P does not have two incomparable chains each of size k. In particular, if P has width w then Bosek, Krawczyk, and Szczypka (SIAM J. Discrete Math., 23(4):1992--1999, 2010) proved an upper bound of ckw^{2} on the number of chains used by First-Fit for some constant c, while Joret and Milans (Order, 28(3):455--464, 2011) gave one of ck^{2}w. In this paper we prove an upper bound of the form ckw. This is best possible up to the value of c.
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。