一類二元關(guān)系的公共后繼指數(shù)集

Let V = {α1, α2,…, αn} be a finite set with n ≥ 2 and Pn(V) the set of all primitive binary relations on V. For Q ∈ Pn(V), denote by G(Q) the directed graph corresponding to Q.For positive integer d ≤ n, let Pn(V, d) = {Q:Q ∈ Pn(V) and G(Q) contains exactly d loops}. In this paper, it is proved that the set of common consequent indices of binary relations in Pn(V, d) is {1, 2 , n - [d/2]}. Furthermore, the minimal extremal binary relations are described.

作 者： 馬紅平 苗正科 MA Hong Ping MIAO Zheng Ke   作者單位： 馬紅平,MA Hong Ping(School of Mathematical Sciences, Xuzhou Normal University, Jiangsu 221116, China)

苗正科,MIAO Zheng Ke(School of Mathematical Sciences, Xuzhou Normal University, Jiangsu 221116, China;Institute of Applied Mathematics, Academy of Mathematics and System Science, Chinese Academy of Science, Beijing 100080, China) 

刊 名： 數(shù)學(xué)研究與評論  ISTIC PKU 英文刊名： JOURNAL OF MATHEMATICAL RESEARCH AND EXPOSITION  年，卷(期)： 2008 28(3)  分類號： O157.5  關(guān)鍵詞： common consequent index   primitive relation   directed graph  

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