2017/05/25 by Chun, Carolyn, Hall, Rhiannon, Merino, Criel +2
#Combinatorics (math.CO) #FOS: Mathematics
paper · doi:10.48550/arxiv.1705.09129
The width of a delta-matroid is the difference in size between a maximal and minimal feasible set. We give a Rough Structure Theorem for delta-matroids that admit a twist of width one. We apply this theorem to give an excluded minor characterisation of delta-matroids that admit a twist of width at most one.