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math.CO2015
Excluding A Grid Minor In Planar Digraphs
Thor Johnson, Neil Robertson, Paul Seymour +1
In [Directed tree-width, J. Combin. Theory Ser. B 82 (2001), 138-154] we introduced the notion of tree-width of directed graphs and presented a conjecture, formulated during discus…
math.CO2015★ 9 cited
Cyclically five-connected cubic graphs
Neil Robertson, P. D. Seymour, Robin Thomas
A cubic graph is cyclically 5-connected if is simple, 3-connected, has at least 10 vertices and for every set of edges of size at most four, at most one component of $G…