2 problems

Let $G$ be a planar bicoloured PBDTP graph, and let its edges carry the geometric signature. Form the associated sign matrix by assigning the corresponding geometric-signature sign…

Let $\mathcal G$ be a graph in the broader class considered by the cited work, with edge set $\mathcal E$, and let $\sigma:\mathcal E\mapsto\{\pm1\}$ be a signature. For every fini…