Willem Haemers

Major fields

Discrete mathematics, combinatorics, algebraic graph theory, finite geometry, design theory and coding theory.

Publications

Research portal Tilburg University; 

ResearchGate; 

arXiv.

Spectra of Graphs, with Andries E. Brouwer, textbook, Springer Universitext, 2012.

Discreet en Mooi, Inaugurele rede (inaugural address in Dutch), September 4, 2009.

Eigenvalue techniques in design and graph theory, Ph.D. thesis, October 30,  1979.

Editorial

Editor (former editor-in-chief) of The Electronic Journal of Combinatorics.

Former editor of Innovations in Incidence Geometry.

Former member of the editorial board of Designs, Codes and Cryptography.

Member of the advisory board of Publications de l'Institut Mathématique (Serbia).

Conferences and workshops

 International Combinatorial Conference October 17-19, 2026, Shijiazhuang, China.

Other things and links

Reader with Addendum for a series of lectures on "Matrix techniques for strongly regular graphs and related geometries", given in Ghent (April 2000).

Videos of an advanced course on eigenvalue techniques in graph theory given in Barcelona (June 2011).

1. Interlacing; the appetizer. 2. More interlacing for the adjacency matrix. 3. Perfect matchings. 4. Regularity and spectral characterizations.

Aida Abiad, Andries E. Brouwer, Edwin van Dam.

UvTmail, Ziggomail.

Paintings by Katrien Haemers.

Affiliation

Department of Econometrics and Operations Research,

Tilburg University, Tilburg, The Netherlands.

E-mail: haemers at uvt dot nl