41 citations · 186 across the 29 of their papers we have counts for
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math.CO2013★ 1 cited
The Nullity Theorem for Principal Pivot Transform
Robert Brijder
We generalize the nullity theorem of Gustafson [Linear Algebra Appl. (1984)] from matrix inversion to principal pivot transform. Several special cases of the obtained result are kn…
math.CO2013★ 2 cited
Quaternary matroids are vf-safe
Robert Brijder, Hendrik Jan Hoogeboom
Binary delta-matroids are closed under vertex flips, which consist of the natural operations of twist and loop complementation. In this note we provide an extension of this result…