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Cycles and paths through vertices whose degrees are at le...
Chengli Li, Feng Liu, Yurui Tang · 2025-06-11 · via math.CO updates on arXiv.org

The bipartite-hole-number of a graph $G$, denoted by $\widetildeα(G)$, is the minimum integer $k$ such that there exist positive integers $s$ and $t$ with $s + t = k + 1$, satisfying the property that for any two disjoint sets $A, B \subseteq V(G)$ with $|A| = s$ and $|B| = t$, there is at least one edge between $A$ and $B$. In 1992, Bollobás and Brightwell, and independently Shi, proved that every $2$-connected graph of order $n$ contains a cycle passing through all vertices whose degrees are at least $\frac{n}{2}$. Motivated by their result, we show that in any $2$-connected graph of order $n$, there exists a cycle containing all vertices whose degrees are at least $\widetildeα(G)$. Moreover, we prove that for any pair of vertices in a connected graph $G$, if their degrees are at least $\widetildeα(G) + 1$, then there exists a path joining them that contains all vertices whose degrees are at least $\widetildeα(G) + 1$. The results extend two existing ones.