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arXiv · 2009.12802

A characterization for graphs having strong parity factors

Hongliang Lu·Zixuan Yang·Xuechun Zhang
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Abstract

A graph $G$ has the \emph{strong parity property} if for every subset $X\subseteq V$ with $|X|$ even, $G$ has a spanning subgraph $F$ with minimum degree at least one such that $d_F(v)\equiv 1\pmod 2$ for all $v\in X$, $d_F(y)\equiv 0\pmod 2$ for all $y\in V(G)-X$. Bujtás, Jendrol and Tuza (On specific factors in graphs, \emph{Graphs and Combin.}, 36 (2020), 1391-1399.) introduced the concept and conjectured that every 2-edge-connected graph with minimum degree at least three has the strong parity property. In this paper, we give a characterization for graphs to have the strong parity property and construct a counterexample to disprove the conjecture proposed by Bujtás, Jendrol and Tuza.

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Hongliang Lu, Zixuan Yang, Xuechun Zhang. 2020-09-27. A characterization for graphs having strong parity factors. https://arxiv.org/abs/2009.12802

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