{ "id": "1709.06854", "version": "v1", "published": "2017-09-20T13:40:10.000Z", "updated": "2017-09-20T13:40:10.000Z", "title": "A note on the 4-girth-thickness of K_{n,n,n}", "authors": [ "Xia Guo", "Yan Yang" ], "categories": [ "math.CO" ], "abstract": "The $4$-girth-thickness $\\theta(4,G)$ of a graph $G$ is the minimum number of planar subgraphs of girth at least four whose union is $G$. In this paper, we obtain that the 4-girth-thickness of complete tripartite graph $K_{n,n,n}$ is $\\big\\lceil\\frac{n+1}{2}\\big\\rceil$ except for $\\theta(4,K_{1,1,1})=2$. And we also show that the $4$-girth-thickness of the complete graph $K_{10}$ is three which disprove the conjecture $\\theta(4,K_{10})=4$ posed by Rubio-Montiel (Ars Math Contemp 14(2) (2018) 319).", "revisions": [ { "version": "v1", "updated": "2017-09-20T13:40:10.000Z" } ], "analyses": { "keywords": [ "ars math contemp", "complete tripartite graph", "minimum number", "planar subgraphs", "complete graph" ], "note": { "typesetting": "TeX", "pages": 0, "language": "en", "license": "arXiv", "status": "editable" } } }