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arxiv: 1705.09129 · v1 · pith:NP7CJM4Jnew · submitted 2017-05-25 · 🧮 math.CO

The structure of delta-matroids with width one twists

classification 🧮 math.CO
keywords widthdelta-matroidsadmitgivestructuretheoremtwistapply
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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.

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