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math.CO2020
The critical number of -free triangle-free binary matroids
Peter Nelson, Kazuhiro Nomoto
A simple binary matroid, viewed as a restriction of a finite binary projective geometry , is -free if for any rank- flat of , its intersection wit…
math.CO2020
The smallest -free and triangle-free binary matroids
Peter Nelson, Kazuhiro Nomoto
We determine the smallest simple triangle-free binary matroids that have no five-element independent flat. This solves a special case of a conjecture of Nelson and Norin.
math.CO2020
The structure of -free and triangle-free binary matroids
Peter Nelson, Kazuhiro Nomoto
A simple binary matroid is called -free if none of its rank-4 flats are independent sets. These objects can be equivalently defined as the sets of points in fo…