R. Brijder

activity

20062026

most citedThe Group Structure of Pivot and Loop Complementation on Graphs and Set Systems

41 citations · 186 across the 29 of their papers we have counts for

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Showing 2018 · math.COShow all

2 papers · 2 filters

math.CO2018

Characterizing $(0, \pm 1)$ -matrices with only even-rank principal submatrices in terms of skew-symmetry

Robert Brijder

We show that every principal submatrix of a square matrix $A$ with only entries in ${0, 1, - 1}$ has even rank if and only if $A$ is skew-symmetric up to multiplication of rows/colu…

math.CO2018

Counterexamples to a conjecture of Las Vergnas

Robert Brijder, Hendrik Jan Hoogeboom

We present counterexamples to a 30-year-old conjecture of Las Vergnas [J. Combin. Theory Ser. B, 1988] regarding the Tutte polynomial of binary matroids.

Characterizing (0,±1)-matrices with only even-rank principal submatrices in terms of skew-symmetry

Counterexamples to a conjecture of Las Vergnas

Characterizing $(0, \pm 1)$ -matrices with only even-rank principal submatrices in terms of skew-symmetry