2 problems

Let $p\geq 3$ be prime. A Hartke $\mathbb{Z}_p$-magic graph is a graph with the Hartke magic-labeling property over $\mathbb{Z}_p$; its order is its number of vertices. Low–Roberts…

Nonzero-coefficient conjecture. One can choose the identifier spanning trees in a way that there is a Vandermonde-completable monomial with nonzero coefficient in