2 papers
math.CO2026
Monotone maximum partial-twuality widths of vf-safe delta-matroids
Qi Yan, Zhao Zhao
For a delta-matroid, the maximum twist width theorem states that the maximum width over all twists can be reached along a non-decreasing sequence of intermediate twist widths. In t…
math.CO2026
Twist polynomial interpolation for binary delta-matroids
Zhao Zhao, Qi Yan
Gross, Mansour and Tucker introduced the partial-dual polynomial of a ribbon graph and asked under what conditions such a polynomial is even-interpolating, odd-interpolating, or bo…