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arXiv · 2607.29127

On the $2$-dimensional flow number of the Flower snarks

Davide Mattiolo·Jozef Rajník
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Abstract

Let $r\ge 2$ be a real number, $d$ a positive integer. A $d$-dimensional nowhere-zero $r$-flow, or $(r,d)$-NZF, on a graph $G$ is an orientation of $G$ together with a function $f\colon E(G)\to \mathbb{R}^d$, such that for all $e\in E(G)$, the Euclidean norm of $f(e)$ lies in the interval $[1,r-1]$, and for every $v\in V(G)$ the sum of all incoming flow values at $v$ equals the sum of all outgoing ones. The $d$-dimensional flow number of $G$ is the parameter $\phi_d(G)=\inf \{r\colon G$ has an $(r,d)$-NZF$\}$. In this paper we provide a lower bound for the $2$-dimensional flow number of the the Flower snark. In particular, together with a previous numerical result by the authors, we prove that $\phi_2(J_n) \in [1 + 2 \sin\frac{5}{22}\pi, 2.387893647]$, where $J_n$ denotes the Flower snark on $4n$ vertices.

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Davide Mattiolo, Jozef Rajník. 2026-07-31. On the $2$-dimensional flow number of the Flower snarks. https://arxiv.org/abs/2607.29127

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