775 citations
- Eindhoven University of TechnologyNL24 papers
- Centrum Wiskunde & InformaticaNL23 papers
- University of AmsterdamNL14 papers
- Centre National de la Recherche ScientifiqueFR9 papers
- University College LondonGB9 papers
- Maastricht UniversityNL8 papers
- Delft University of TechnologyNL7 papers
- UCLouvainBE7 papers
- Universitat Politècnica de CatalunyaES7 papers
- University of AntwerpBE7 papers
- University of GroningenNL7 papers
- Georgia Institute of TechnologyUS6 papers
12 papers · 1 filter
Switched symplectic graphs and their 2-ranks
Aida Abiad, Willem H. Haemers
We apply Godsil-McKay switching to the symplectic graphs over with at least 63 vertices and prove that the 2-rank of (the adjacency matrix of) the graph increases af…
Distance-regular graphs
Edwin R. van Dam, Jack H. Koolen, Hajime Tanaka
This is a survey of distance-regular graphs. We present an introduction to distance-regular graphs for the reader who is unfamiliar with the subject, and then give an overview of s…
Cospectral regular graphs with and without a perfect matching
Zoltan L. Blazsik, Jay Cummings, Willem H. Haemers
For each we construct a pair of cospectral -regular graphs, where one has a perfect matching and the other one not. This solves a research problem posed by the third…
Notes on simplicial rook graphs
Andries E. Brouwer, Sebastian M. Cioabă, Willem H. Haemers +1
The simplicial rook graph is the graph of which the vertices are the sequences of nonnegative integers of length summing to , where two such sequences are ad…
Mixed integer programming improves comprehensibility and plan quality in inverse optimization of prostate HDR-brachytherapy
Bram L. Gorissen, Dick den Hertog, Aswin L. Hoffmann
Current inverse treatment planning methods that optimize both catheter positions and dwell times in prostate HDR brachytherapy use surrogate linear or quadratic objective functions…
The quadratic assignment problem is easy for Robinsonian matrices with Toeplitz structure
Monique Laurent, Matteo Seminaroti
We present a new polynomially solvable case of the Quadratic Assignment Problem in Koopmans-Beckman form , by showing that the identity permutation is optimal when an…