3 citations · 12 across the 17 of their papers we have counts for
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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…
Godsil-McKay switching and isomorphism
Aida Abiad, Andries E. Brouwer, Willem H. Haemers
Godsil-McKay switching is an operation on graphs that doesn't change the spectrum of the adjacency matrix. Usually (but not always) the obtained graph is non-isomorphic with the or…
Lossy gossip and composition of metrics
Andries E. Brouwer, Jan Draisma, Bart J. Frenk
We study the monoid generated by n-by-n distance matrices under tropical (or min-plus) multiplication. Using the tropical geometry of the orthogonal group, we prove that this monoi…
The degrees of a system of parameters of the ring of invariants of a binary form
Andries E. Brouwer, Jan Draisma, Mihaela Popoviciu
We consider the degrees of the elements of a homogeneous system of parameters for the ring of invariants of a binary form, give a divisibility condition, and a complete classificat…