On cordial labeling of hypertrees

Michał Tuczyński, Przemysław Wenus, Krzysztof Węsek

Let $f:V\to {\mathbb{Z}}_k$ be a vertex labeling of a hypergraph $H=(V,E)$. This labeling induces an~edge labeling of $H$ defined by $f(e)={\sum }_{v\in e}f(v)$, where the sum is…