k-connectedness and vertex-pancyclicity do not force pancyclic edges

An edge of a graph of order n is pancyclic if it lies in a cycle of every length 3 , … , n . A graph of order n is vertex-pancyclic if every vertex lies in a cycle of every length 3 , … , n . Recently, Li and Zhan proved that every 2-connected graph of order at least seven in which any induced subgraph on four vertices has at least two edges contains a pancyclic edge, and Zhan asked whether there exists a positive integer k such that every k -connected vertex-pancyclic graph contains a pancyclic edge (Li and Zhan 2026). We answer this question by showing that for every positive integer k , there is a k -connected vertex-pancyclic graph containing no pancyclic edge.

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Publication Details

Journal
Discrete Applied Mathematics
Published
2026-10-05
DOI
https://doi.org/10.1016/j.dam.2026.09.039
Primary Topic
Advanced Graph Theory Research
Type
article
Field-Weighted Citation Impact
0.00
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article

k-connectedness and vertex-pancyclicity do not force pancyclic edges

Leyou Xu, Bo Zhou
Discrete Applied Mathematics
Advanced Graph Theory Research
article

k-connectedness and vertex-pancyclicity do not force pancyclic edges

Leyou Xu, Bo Zhou
article en

Abstract

An edge of a graph of order n is pancyclic if it lies in a cycle of every length 3 , … , n . A graph of order n is vertex-pancyclic if every vertex lies in a cycle of every length 3 , … , n . Recently, Li and Zhan proved that every 2-connected graph of order at least seven in which any induced subgraph on four vertices has at least two edges contains a pancyclic edge, and Zhan asked whether there exists a positive integer k such that every k -connected vertex-pancyclic graph contains a pancyclic edge (Li and Zhan 2026). We answer this question by showing that for every positive integer k , there is a k -connected vertex-pancyclic graph containing no pancyclic edge.

Discrete Applied MathematicsVol. 396
South China Normal University (CN)
Openalex Percentile: Top 12%
Advanced Graph Theory Research
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