Describing Graphs: A First-Order Approach to Graph Canonization

Describing Graphs: A First-Order Approach to Graph Canonization
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描述图:图规范化的一阶方法

DOI:
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发表时间:
1990
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通讯作者:
E. Lander
E. Lander
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作者:
N. Immerman;E. Lander

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在本文中,我们问的问题,“什么必须添加到一阶逻辑加上最小不动点,以获得确切的多项式时间性质的无序图?”我们认为语言L k组成的一阶逻辑限制到k个变量和C k组成的L k加上“计数量词”。我们给出了有效的标准化算法的特征在于Ck或Lk的图。它遵循从已知的结果,所有的树和几乎所有的图的特征在于C2。
In this paper we ask the question, “What must be added to first-order logic plus least-fixed point to obtain exactly the polynomial-time properties of unordered graphs?” We consider the languages L k consisting of first-order logic restricted to k variables and C k consisting of L k plus “counting quantifiers”. We give efficient canonization algorithms for graphs characterized by C k or L k . It follows from known results that all trees and almost all graphs are characterized by C 2.