{ "id": "1005.0582", "version": "v1", "published": "2010-05-04T16:49:51.000Z", "updated": "2010-05-04T16:49:51.000Z", "title": "An extremal theorem in the hypercube", "authors": [ "David Conlon" ], "comment": "6 pages", "categories": [ "math.CO" ], "abstract": "The hypercube Q_n is the graph whose vertex set is {0,1}^n and where two vertices are adjacent if they differ in exactly one coordinate. For any subgraph H of the cube, let ex(Q_n, H) be the maximum number of edges in a subgraph of Q_n which does not contain a copy of H. We find a wide class of subgraphs H, including all previously known examples, for which ex(Q_n, H) = o(e(Q_n)). In particular, our method gives a unified approach to proving that ex(Q_n, C_{2t}) = o(e(Q_n)) for all t >= 4 other than 5.", "revisions": [ { "version": "v1", "updated": "2010-05-04T16:49:51.000Z" } ], "analyses": { "subjects": [ "05C35" ], "keywords": [ "extremal theorem", "vertex set", "maximum number", "wide class", "coordinate" ], "note": { "typesetting": "TeX", "pages": 6, "language": "en", "license": "arXiv", "status": "editable", "adsabs": "2010arXiv1005.0582C" } } }