{ "id": "1809.10298", "version": "v1", "published": "2018-09-26T17:58:39.000Z", "updated": "2018-09-26T17:58:39.000Z", "title": "Ramsey and Gallai-Ramsey numbers for two classes of unicyclic graphs", "authors": [ "Zhao Wang", "Yaping Mao", "Colton Magnant", "Jinyu Zou" ], "comment": "17 pages. arXiv admin note: text overlap with arXiv:1802.04930", "categories": [ "math.CO" ], "abstract": "Given a graph $G$ and a positive integer $k$, define the \\emph{Gallai-Ramsey number} to be the minimum number of vertices $n$ such that any $k$-edge coloring of $K_n$ contains either a rainbow (all different colored) triangle or a monochromatic copy of $G$. In this paper, we consider two classes of unicyclic graphs, the star with an extra edge and the path with a triangle at one end. We provide the $2$-color Ramsey numbers for these two classes of graphs and use these to obtain general upper and lower bounds on the Gallai-Ramsey numbers.", "revisions": [ { "version": "v1", "updated": "2018-09-26T17:58:39.000Z" } ], "analyses": { "subjects": [ "05C55" ], "keywords": [ "unicyclic graphs", "gallai-ramsey numbers", "color ramsey numbers", "lower bounds", "minimum number" ], "note": { "typesetting": "TeX", "pages": 17, "language": "en", "license": "arXiv", "status": "editable" } } }