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Neil Robertson

Minor relations for directed graphs

Abstract for the Special Combinatorics Seminar Friday, April 23, 1999

The beginning of a general theory of digraph minors is struggling to appear. What are the primary inclusion relations? What structure theory reflects tree-width and universal surface structure? Where does well-quasi-ordering come into the picture? Are there interesting algorithmical decision problems that are not NP hard? Is there any prospect of a coherent body of theorems central to directed graphs? Some formal and informal reflections on these questions (representing the graph minor people) will be the subject matter of this talk.

seminars/comb/abstract.19990423.txt · Last modified: 2020/01/29 14:03 (external edit)