{"title":"广义Turán问题的一个非对齐变量","authors":"Dániel Gerbner","doi":"10.1007/s00026-023-00640-8","DOIUrl":null,"url":null,"abstract":"<div><p>In the so-called generalized Turán problems we study the largest number of copies of <i>H</i> in an <i>n</i>-vertex <i>F</i>-free graph <i>G</i>. Here we introduce a variant, where <i>F</i> is not forbidden, but we restrict how copies of <i>H</i> and <i>F</i> can be placed in <i>G</i>. More precisely, given an integer <i>n</i> and graphs <i>H</i> and <i>F</i>, what is the largest number of copies of <i>H</i> in an <i>n</i>-vertex graph such that the vertex set of that copy does not contain and is not contained in the vertex set of a copy of <i>F</i>? We solve this problem for some instances, give bounds in other instances, and we use our results to determine the generalized Turán number for some pairs of graphs.</p></div>","PeriodicalId":0,"journal":{"name":"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00026-023-00640-8.pdf","citationCount":"0","resultStr":"{\"title\":\"A Non-aligning Variant of Generalized Turán Problems\",\"authors\":\"Dániel Gerbner\",\"doi\":\"10.1007/s00026-023-00640-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In the so-called generalized Turán problems we study the largest number of copies of <i>H</i> in an <i>n</i>-vertex <i>F</i>-free graph <i>G</i>. Here we introduce a variant, where <i>F</i> is not forbidden, but we restrict how copies of <i>H</i> and <i>F</i> can be placed in <i>G</i>. More precisely, given an integer <i>n</i> and graphs <i>H</i> and <i>F</i>, what is the largest number of copies of <i>H</i> in an <i>n</i>-vertex graph such that the vertex set of that copy does not contain and is not contained in the vertex set of a copy of <i>F</i>? We solve this problem for some instances, give bounds in other instances, and we use our results to determine the generalized Turán number for some pairs of graphs.</p></div>\",\"PeriodicalId\":0,\"journal\":{\"name\":\"\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0,\"publicationDate\":\"2023-02-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1007/s00026-023-00640-8.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"\",\"FirstCategoryId\":\"100\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s00026-023-00640-8\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"","FirstCategoryId":"100","ListUrlMain":"https://link.springer.com/article/10.1007/s00026-023-00640-8","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
在所谓的广义图兰数问题中,我们研究的是在 n 个无顶点 F 的图 G 中 H 的最大副本数。更确切地说,给定一个整数 n 以及图 H 和 F,那么在 n 个顶点图中,H 的最大副本数是多少,使得该副本的顶点集不包含且不包含在 F 副本的顶点集中?我们解决了某些情况下的这一问题,给出了其他情况下的界限,并利用我们的结果确定了某些图对的广义图兰数。
A Non-aligning Variant of Generalized Turán Problems
In the so-called generalized Turán problems we study the largest number of copies of H in an n-vertex F-free graph G. Here we introduce a variant, where F is not forbidden, but we restrict how copies of H and F can be placed in G. More precisely, given an integer n and graphs H and F, what is the largest number of copies of H in an n-vertex graph such that the vertex set of that copy does not contain and is not contained in the vertex set of a copy of F? We solve this problem for some instances, give bounds in other instances, and we use our results to determine the generalized Turán number for some pairs of graphs.