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  • Willem H Haemers
2011

The beauty of discrete mathematics

Haemers, W. H., 2011, In : Asset Magazine. 26, p. 16-19

Research output: Contribution to journalArticleProfessional

Open Access
File
398 Downloads (Pure)

An odd characterization of the generalized odd graphs

van Dam, E. R. & Haemers, W. H., 2011, In : Journal of Combinatorial Theory, Series B, Graph theory. 101, 6, p. 486-489

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
238 Downloads (Pure)

Universal adjacency matrices with two eigenvalues

Haemers, W. H. & Omidi, G. R., 2011, In : Linear Algebra and its Applications. 435, 10, p. 2520-2529

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2016

Switched symplectic graphs and their 2-ranks

Abiad, A. & Haemers, W. H., 2016, In : Designs, Codes and Cryptography. 81, 1, p. 35-41

Research output: Contribution to journalArticleScientificpeer-review

Open Access

Are almost all graphs determined by their spectrum?

Haemers, W. H., 2016, In : Notices of the South African Mathematical Society. 47, p. 42-45

Research output: Contribution to journalArticleScientific

2020

Spectral Symmetry in Conference Matrices

Haemers, W. H. & Parsaei Majd, L., 13 Apr 2020, Ithaca: Cornell University Library, (arXiv; vol. 2004.05829).

Research output: Working paperOther research output

Open Access
2012

One and one and one is three

Haemers, W. H., 2012, Dima Fon-Der-Flaass. Konstantinova, E. V. (ed.). Novosibirsk: Sobolev Institute for Mathematics, p. 145-147 396 p.

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

2018

Signed graphs cospectral with the path

Akbari, S., Haemers, W. H., Maimani, H. R. & Parsaei Majd, L., 15 Sep 2018, In : Linear Algebra and its Applications. 553, p. 104-116

Research output: Contribution to journalArticleScientificpeer-review

2017

Matrices and graphs

Haemers, W. H., 2017, Handbook of Linear Algebra. Hogben, L., Brualdi, R., Greenbaum, A. & Mathias, R. (eds.). 2 ed. Chapman and Hall/CRC, p. 28-1-28-14 (Handbook of Linear Algebra).

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

2014

Walk regular divisible design graphs

Crnkovic, D. & Haemers, W. H., Jul 2014, In : Designs, Codes and Cryptography. 72, 1, p. 165-175

Research output: Contribution to journalArticleScientificpeer-review

2012

Preface: Geometric and algebraic combinatorics

Van Dam, E. R. & Haemers, W. H., Oct 2012, In : Designs, Codes, and Cryptography. 65, 1-2, p. 1-3

Research output: Contribution to journalArticleProfessional

Open Access

Seidel Switching and Graph Energy

Haemers, W. H., 2012, Tilburg: Operations research, 8 p. (CentER Discussion Paper; vol. 2012-023).

Research output: Working paperDiscussion paperOther research output

File
298 Downloads (Pure)
2015

Cospectral regular graphs with and without a perfect matching

Blazsik, Z., Cummings, J. & Haemers, W. H., Mar 2015, In : Discrete Mathematics. 338, 3, p. 199-201

Research output: Contribution to journalArticleScientificpeer-review

2018

On the spectral characterization of mixed extensions of P3

Haemers, W. H., Sorgun, S. & Topcu, H., 30 Oct 2018, Ithaca: Cornell University Library, 10 p. (arXiv; vol. 1810.12615).

Research output: Working paperOther research output

Open Access
File
6 Downloads (Pure)
2020

On sign-symmetric signed graphs

Ghorbani, E., Haemers, W. H., Maimani, H. R. & Parsaei Majd, L., Mar 2020, Ithaca: Cornell University Library, 12 p. (arXiv; vol. 2003.09981).

Research output: Working paperOther research output

Open Access
File
2011

The Maximum Order of Reduced Square(0, 1)-Matrices with a Given Rank

Haemers, W. H. & Peeters, M. J. P., 2011, Tilburg: Operations research, (CentER Discussion Paper; vol. 2011-113).

Research output: Working paperDiscussion paperOther research output

File
236 Downloads (Pure)
2012

Cospectral Graphs and Regular Orthogonal Matrices of Level 2

Abiad, A. & Haemers, W. H., 2012, Tilburg: Operations research, 16 p. (CentER Discussion Paper; vol. 2012-042).

Research output: Working paperDiscussion paperOther research output

File
259 Downloads (Pure)

Skew-adjacency matrices of graphs

Cavers, M., Cioaba, S. M., Fallat, S., Gregory, D. A., Haemers, W. H., Kirkland, S. J., McDonald, J. J. & Tsatsomeros, M., 2012, In : Linear Algebra and its Applications. 436, 12, p. 4512-4529

Research output: Contribution to journalArticleScientificpeer-review

2018

Cospectral mates for the union of some classes in the Johnson association scheme

Cioabă, S. M., Haemers, W. H., Johnston, T. & McGinnis, M., 15 Feb 2018, In : Linear Algebra and its Applications. 539, p. 219-228

Research output: Contribution to journalArticleScientificpeer-review

2017

Preface to the special issue dedicated to Andries E. Brouwer

Blokhuis, A., van Dam, E. R., Haemers, W. H. & Koolen, J. H., Jul 2017, In : Designs, Codes, and Cryptography. 84, 1-2, p. 1-2

Research output: Contribution to journalEditorialScientific

2015

Godsil-McKay switching and isomorphism,

Abiad, A., Brouwer, A. E. & Haemers, W. H., 2015, In : Electronic Journal of Linear Algebra. 28, p. 4-11

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2016

Notes on simplicial rook graphs

Brouwer, A. E., Cioabă, S. M., Haemers, W. H. & Vermette, J. R., Jun 2016, In : Journal of Algebraic Combinatorics. 43, 4, p. 783-799

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2014

Spectral characterizations of almost complete graphs

Camara, M. & Haemers, W. H., Oct 2014, In : Discrete Applied Mathematics. 176, p. 19-23

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2017

The graphs with all but two eigenvalues equal to - 2 or 0

Cioabă, S. M., Haemers, W. H. & Vermette, J. R., 1 Jul 2017, In : Designs, Codes and Cryptography. 84, 1-2, p. 153-163

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2012

The maximum order of reduced square (0,1)-matrices with a given rank

Haemers, W. H. & Peeters, M. J. P., 2012, In : Electronic Journal of Linear Algebra. 24, p. 3-6

Research output: Contribution to journalArticleScientificpeer-review

2011

More about Divisible Design Graphs

Crnkovic, D. & Haemers, W. H., 2011, Tilburg: Operations research, 11 p. (CentER Discussion Paper; vol. 2011-140).

Research output: Working paperDiscussion paperOther research output

File
227 Downloads (Pure)

Matrices for graphs designs and codes

Haemers, W. H., 2011, Information Security, Coding Theory and Related Combinatorics: Information coding and combinatories. Crnkovic, D. & Tonchev, V. (eds.). Amsterdam: IOS Press, p. 253-277 460 p. (NATO Science for Peace and Security Series - D: Information and Communication Security; no. 29).

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

2020

Universal Spectra of the Disjoint Union of Regular Graphs

Haemers, W. H. & Oboudi, M. R., 6 Apr 2020, Ithaca: Cornell University Library, 4 p. (arXiv; vol. 2004.02499).

Research output: Working paperOther research output

2018

The chromatic index of strongly regular graphs

Cioabă, S. M., Guo, K. & Haemers, W. H., Oct 2018, Ithaca: Cornell University Library, 12 p. (arXiv; vol. 1810.06660).

Research output: Working paperOther research output

Open Access
File
14 Downloads (Pure)
2012

Seidel switching and graph energy

Haemers, W. H., 2012, In : MATCH, Communications in Mathematical and in Computer Chemistry. 68, 3, p. 653-659

Research output: Contribution to journalArticleScientificpeer-review

Cospectral graphs and regular orthogonal matrices of level 2

Abiad, A. & Haemers, W. H., 2012, In : The Electronic Journal of Combinatorics: EJC. 19, 3, P13.

Research output: Contribution to journalArticleScientificpeer-review

2016

On the spectral characterization of pineapple graphs

Topcu, H., Sorgun, S. & Haemers, W. H., Oct 2016, In : Linear Algebra and its Applications. 507, p. 267-273

Research output: Contribution to journalArticleScientificpeer-review

2012

Spectra of Graphs

Brouwer, A. E. & Haemers, W. H., 2012, Heidelberg: Springer Verlag. 250 p. (Universitext)

Research output: Book/ReportBook

2015

The graphs with all but two eigenvalues equal to ±1

Cioaba, S. M., Haemers, W. H., Vermette, J. R. & Wong, W., May 2015, In : Journal of Algebraic Combinatorics. 41, 3, p. 887-897

Research output: Contribution to journalArticleScientificpeer-review

2012

The graph with spectrum 14^1 2^40 (−4)^10 (−6)^9

Blokhuis, A., Brouwer, A. E. & Haemers, W. H., 2012, In : Designs Codes and Cryptography. 65, 1-2, p. 71-75

Research output: Contribution to journalArticleScientificpeer-review

2014

Regular graphs with maximal energy per vertex

van Dam, E. R., Haemers, W. H. & Koolen, J. H., 2014, In : Journal of Combinatorial Theory, Series B, Graph theory. 107, July 2014, p. 123-131

Research output: Contribution to journalArticleScientificpeer-review

Open Access
File
263 Downloads (Pure)

An interlacing approach for bounding the sum of Laplacian eigenvalues of graphs

Abiad, A., Fiol, M. A., Haemers, W. H. & Perarnau, G., May 2014, In : Linear Algebra and its Applications. 448, p. 11-21

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2020

Cospectral pairs of regular graphs with different connectivity

Haemers, W. H., Feb 2020, In : Discussiones Mathematicae Graph Theory. 40, 2, p. 577-584

Research output: Contribution to journalArticleScientificpeer-review

Open Access
2012

The maximum order of adjacency matrices with a given rank

Haemers, W. H. & Peeters, M. J. P., 2012, In : Designs Codes and Cryptography. 65, 3, p. 223-232

Research output: Contribution to journalArticleScientificpeer-review

2011

Divisible design graphs

Haemers, W. H., Kharaghani, H. & Meulenberg, M. A., 2011, In : Journal of Combinatorial Theory, Series A, Structures designs and application combinatorics. 118, 3, p. 978-992

Research output: Contribution to journalArticleScientificpeer-review

Open Access