id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,work_issues,upstream,reviewer,author,merged,dependencies,stopgaps
9779,Grotzsch graph and Mycielski graphs,edward.scheinerman,"jason, ncohen, rlm",Added methods to create the Grotzsch graph and the Mycielski graphs. The Mycielski graphs are a sequence of triangle-free graphs with arbitrarily high chromatic number. The Grotzsch graph is (isomorphic to) the fourth graph in this series; it it triangle-free and has chromatic number equal to 4.,enhancement,closed,major,sage-4.6,graph theory,fixed,,,,N/A,Nathann Cohen,Ed Scheinerman,sage-4.6.alpha2,,