Perfect matching cover indices of generalized rotation snarks

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2024-10-10 DOI:10.1016/j.amc.2024.129101
Wenjuan Zhou, Rong-Xia Hao, Yilun Luo
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Abstract

Let Γ be a 3-regular bridgeless graph and τ(Γ) be the perfect matching cover index of Γ. It is conjectured by Berge that τ(Γ)5. Esperet and Mazzuoccolo (2013) [4] proved that deciding whether Γ satisfies τ(Γ)4 is NP-complete. Máčajová and Škoviera (2021) [13] gave a family R={Rk:k4} of rotation snarks. We construct a family FR={FR2n+1:n1} of generalized rotation snarks. In this paper, we show that each FR2n+1 satisfies τ(FR2n+1)=4. As a corollary, each Rk satisfies τ(Rk)=4.
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广义旋转星痕的完美匹配覆盖指数
设 Γ 是一个三规则无桥图,τ(Γ) 是 Γ 的完全匹配覆盖指数。根据 Berge 的猜想,τ(Γ)≤5。Esperet 和 Mazzuoccolo (2013) [4] 证明,判断 Γ 是否满足 τ(Γ)≤4 是 NP-完全的。Máčajová 和 Škoviera (2021) [13] 给出了一个旋转星痕族 R={Rk:k≥4}。我们构建了一个广义旋转夸克族 FR={FR2n+1:n≥1}。在本文中,我们证明每个 FR2n+1 都满足 τ(FR2n+1)=4 的条件。作为推论,每个 Rk 满足 τ(Rk)=4 。
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7.20
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4.30%
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567
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