Program termination and well partial orderings

Author:

Blass Andreas1,Gurevich Yuri2

Affiliation:

1. University of Michigan, Ann Arbor, MI

2. Microsoft Research, Redmond, WA

Abstract

The following known observation is useful in establishing program termination: if a transitive relation R is covered by finitely many well-founded relations U 1 ,…, U n then R is well-founded. A question arises how to bound the ordinal height | R | of the relation R in terms of the ordinals α i = | U i |. We introduce the notion of the statureP ∥ of a well partial ordering P and show that | R | ≤ ∥α 1 × … × α n ∥ and that this bound is tight. The notion of stature is of considerable independent interest. We define ∥ P ∥ as the ordinal height of the forest of nonempty bad sequences of P , but it has many other natural and equivalent definitions. In particular, ∥ P ∥ is the supremum, and in fact the maximum, of the lengths of linearizations of P . And ∥α 1 × … × α n ∥ is equal to the natural product α 1 ⊗ … ⊗ α n .

Funder

Division of Mathematical Sciences

Publisher

Association for Computing Machinery (ACM)

Subject

Computational Mathematics,Logic,General Computer Science,Theoretical Computer Science

Cited by 13 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3