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math.CO2026
Unavoidable flats in GF(q)-representable matroids
Jim Geelen, Matthew E. Kroeker, Peter Nelson
We show that, for any finite field and positive integer , a simple -representable matroid with sufficiently high rank contains a rank- flat which…
math.CO2026
Ordinary lines, point degrees, and matroid density
Matthew E. Kroeker, Ben Lund
For every set of points in with full affine span, we prove that some point lies on at least spanned lines, which is best possible in every dimensi…