2 problems

Let $H$ and $K$ be simplicial complexes, and write $H<K$ when $H$ is a minor of $K$, obtained by admissible contractions and deletions. Let $m$ be a nonnegative integer. Minor mono…

Let $A$ be a totally positive $n\times n$ matrix. For index sequences $\alpha$ and $\beta$ defining products of minors, write $\alpha/\beta$ for the corresponding ratio. A ratio is…