On asymptotically tight bound for the conflict-free chromatic index of nearly regular graphs
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912010670702592 |
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| author | Kamyczura, Mateusz Przybyło, Jakub |
| author_facet | Kamyczura, Mateusz Przybyło, Jakub |
| contents | Let $G$ be a graph of maximum degree $Δ$ which does not contain isolated vertices. An edge coloring $c$ of $G$ is called conflict-free if each edge's closed neighborhood includes a uniquely colored element. The least number of colors admitting such $c$ is called the conflict-free chromatic index of $G$ and denoted $χ'_{\rm CF}(G)$. It is known that in general $χ'_{\rm CF}(G)\leq 3 \lceil \log_2Δ\rceil+1$, while there is a family of graphs, e.g. the complete graphs, for which $χ'_{\rm CF}(G)\geq (1-o(1))\log_2Δ$. In the present paper we provide the asymptotically tight upper bound $χ'_{\rm CF}(G)\leq (1+o(1))\log_2Δ$ for regular and nearly regular graphs, which in particular implies that the same bound holds a.a.s. for a random graph $G=G(n,p)$ whenever $p\gg n^{-\varepsilon}$ for any fixed constant $\varepsilon\in (0,1)$. Our proof is probabilistic and exploits classic results of Hall and Berge. This was inspired by our approach utilized in the particular case of complete graphs, for which we give a more specific upper bound. We also observe that almost the same bounds hold in the open neighborhood regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_00759 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On asymptotically tight bound for the conflict-free chromatic index of nearly regular graphs Kamyczura, Mateusz Przybyło, Jakub Combinatorics 05C15 Let $G$ be a graph of maximum degree $Δ$ which does not contain isolated vertices. An edge coloring $c$ of $G$ is called conflict-free if each edge's closed neighborhood includes a uniquely colored element. The least number of colors admitting such $c$ is called the conflict-free chromatic index of $G$ and denoted $χ'_{\rm CF}(G)$. It is known that in general $χ'_{\rm CF}(G)\leq 3 \lceil \log_2Δ\rceil+1$, while there is a family of graphs, e.g. the complete graphs, for which $χ'_{\rm CF}(G)\geq (1-o(1))\log_2Δ$. In the present paper we provide the asymptotically tight upper bound $χ'_{\rm CF}(G)\leq (1+o(1))\log_2Δ$ for regular and nearly regular graphs, which in particular implies that the same bound holds a.a.s. for a random graph $G=G(n,p)$ whenever $p\gg n^{-\varepsilon}$ for any fixed constant $\varepsilon\in (0,1)$. Our proof is probabilistic and exploits classic results of Hall and Berge. This was inspired by our approach utilized in the particular case of complete graphs, for which we give a more specific upper bound. We also observe that almost the same bounds hold in the open neighborhood regime. |
| title | On asymptotically tight bound for the conflict-free chromatic index of nearly regular graphs |
| topic | Combinatorics 05C15 |
| url | https://arxiv.org/abs/2409.00759 |