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when toggle format what by license comment
Feb 25, 2011 at 21:59 comment added Hermann Gruber I think that this is not true: apparently Halin discovered the concept some ten years earlier, but that remained largely unnoticed until Robertson and Seymour's rediscovery. See the answer below for details.
Feb 19, 2011 at 18:20 history edited David Eppstein CC BY-SA 2.5
Ellis et al 1983
Feb 19, 2011 at 17:41 vote accept Akash Kumar
Apr 10, 2011 at 3:40
Feb 19, 2011 at 17:20 history edited David Eppstein CC BY-SA 2.5
say how separators relate
Feb 19, 2011 at 17:13 history answered David Eppstein CC BY-SA 2.5