The excluded minors for three classes of 2-polymatroids having special types of natural matroids

Joseph E. Bonin, Kevin Long

If $\mathcal{C}$ is a minor-closed class of matroids, the class ${\mathcal{C}}^{\prime }$ of integer polymatroids whose natural matroids are in $\mathcal{C}$ is also minor closed, as is the c…