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math.CO2021
Permutations Avoiding Certain Partially-ordered Patterns
Kai Ting Keshia Yap, David Wehlau, Imed Zaguia
A permutation contains a pattern if and only if there is a subsequence in with its letters are in the same relative order as those in . Partially ordered patterns (P…
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.CO2004
Complete caps in projective space which are disjoint from a subspace of codimension two
David L. Wehlau
Working over the field of order 2 we consider those complete caps (maximal sets of points with no three collinear) which are disjoint from some codimension 2 subspace of projective…