2 problems

Let $\mathcal{P}$ be an irreducible, tridiagonal sign pattern with a $0$-diagonal. A sign pattern is consistent when it has the consistency property defined in the paper, and it re…

Let $\mathcal{A}$ be an irreducible, tridiagonal sign pattern with a $0$-diagonal. Its signed undirected graph has at most one maximal signed path with odd length. Eschenbach–Johns…