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math.CO2016
Topologically -chromatic graphs and signatures of odd cycles
Gord Simons, Claude Tardif, David Wehlau
We investigate group-theoretic "signatures" of odd cycles of a graph, and their connections to topological obstructions to 3-colourability. In the case of signatures derived from f…
math.CO2016★ 1 cited
Generalised Mycielski graphs and bounds on chromatic numbers
Gord Simons, Claude Tardif, David Wehlau
We prove that the coindex of the box complex of a graph can be measured by the generalised Mycielski graphs which admit a homomorphism to it. As a consequence,…