This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects:

Computer science Low‑importance This article is within the scope of WikiProject Computer science, a collaborative effort to improve the coverage of Computer science related articles on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.Computer scienceWikipedia:WikiProject Computer scienceTemplate:WikiProject Computer scienceComputer science articles Low This article has been rated as Low-importance on the project's importance scale. Things you can help WikiProject Computer science with: Here are some tasks awaiting attention: Article requests : Requested articles/Applied arts and sciences/Computer science, computing, and Internet Cleanup : Computer science articles needing attention Computer science articles needing expert attention Copyedit : Computing Expand : Computer science Infobox : Computer science articles without infoboxes Maintain : Timeline of computing 2020–present Photo : Find pictures for the biographies of computer scientists (see List of computer scientists) Computing articles needing images Stubs : Computer science stubs Unreferenced : WikiProject Computer science/Unreferenced BLPs Project-related : Tag all relevant articles in Category:Computer science and sub-categories with {{ WikiProject Computer science}} Philosophy: Logic Low‑importance This article is within the scope of WikiProject Philosophy, a collaborative effort to improve the coverage of content related to philosophy on Wikipedia. If you would like to support the project, please visit the project page, where you can get more details on how you can help, and where you can join the general discussion about philosophy content on Wikipedia.PhilosophyWikipedia:WikiProject PhilosophyTemplate:WikiProject PhilosophyPhilosophy articles Low This article has been rated as Low-importance on the project's importance scale. Associated task forces: /  Logic Mathematics Low‑priority This article is within the scope of WikiProject Mathematics, a collaborative effort to improve the coverage of mathematics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.MathematicsWikipedia:WikiProject MathematicsTemplate:WikiProject Mathematicsmathematics articles Low This article has been rated as Low-priority on the project's priority scale.

Should not this entire section be moved to the article Star height problem.  Or perhaps that entire article should be moved and combined with this article.  Howard McCay ( talk) 03:56, 24 July 2012 (UTC) reply

Also the definitions for Cycle rank are duplicated here, necessitating duplicate maintenance and allowing potential inconsistency.  So maybe these definitions should be replaced by a reference and link.  Howard McCay ( talk) 03:56, 24 July 2012 (UTC) reply