2 problems

Let $(M_k\mid k\in K)$ be a family of matroids. A wave is a set together with disjoint spanning sets for the restrictions of the matroids to that set; a family is unhindered when i…

Let $(M_k\mid k\in K)$ be a family of matroids on the same ground set $E$. A packing consists of pairwise disjoint spanning sets, one for each $M_k$, and a covering consists of ind…