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{"title":"关于雏菊的拉姆齐数 II","authors":"Marcelo Sales","doi":"10.1017/s0963548324000208","DOIUrl":null,"url":null,"abstract":"A <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline1.png\"/> <jats:tex-math> $(k+r)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-uniform hypergraph <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline2.png\"/> <jats:tex-math> $H$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> on <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline3.png\"/> <jats:tex-math> $(k+m)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> vertices is an <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline4.png\"/> <jats:tex-math> $(r,m,k)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-daisy if there exists a partition of the vertices <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline5.png\"/> <jats:tex-math> $V(H)=K\\cup M$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> with <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline6.png\"/> <jats:tex-math> $|K|=k$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline7.png\"/> <jats:tex-math> $|M|=m$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> such that the set of edges of <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline8.png\"/> <jats:tex-math> $H$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> is all the <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline9.png\"/> <jats:tex-math> $(k+r)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-tuples <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline10.png\"/> <jats:tex-math> $K\\cup P$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>, where <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline11.png\"/> <jats:tex-math> $P$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> is an <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline12.png\"/> <jats:tex-math> $r$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-tuple of <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline13.png\"/> <jats:tex-math> $M$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>. We obtain an <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline14.png\"/> <jats:tex-math> $(r-2)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-iterated exponential lower bound to the Ramsey number of an <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline15.png\"/> <jats:tex-math> $(r,m,k)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-daisy for <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline16.png\"/> <jats:tex-math> $2$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-colours. This matches the order of magnitude of the best lower bounds for the Ramsey number of a complete <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0963548324000208_inline17.png\"/> <jats:tex-math> $r$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-graph.","PeriodicalId":10503,"journal":{"name":"Combinatorics, Probability and Computing","volume":"1 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"On the Ramsey numbers of daisies II\",\"authors\":\"Marcelo Sales\",\"doi\":\"10.1017/s0963548324000208\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline1.png\\\"/> <jats:tex-math> $(k+r)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-uniform hypergraph <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline2.png\\\"/> <jats:tex-math> $H$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> on <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline3.png\\\"/> <jats:tex-math> $(k+m)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> vertices is an <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline4.png\\\"/> <jats:tex-math> $(r,m,k)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-daisy if there exists a partition of the vertices <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline5.png\\\"/> <jats:tex-math> $V(H)=K\\\\cup M$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> with <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline6.png\\\"/> <jats:tex-math> $|K|=k$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline7.png\\\"/> <jats:tex-math> $|M|=m$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> such that the set of edges of <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline8.png\\\"/> <jats:tex-math> $H$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> is all the <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline9.png\\\"/> <jats:tex-math> $(k+r)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-tuples <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline10.png\\\"/> <jats:tex-math> $K\\\\cup P$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>, where <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline11.png\\\"/> <jats:tex-math> $P$ </jats:tex-math> </jats:alternatives> </jats:inline-formula> is an <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline12.png\\\"/> <jats:tex-math> $r$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-tuple of <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline13.png\\\"/> <jats:tex-math> $M$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>. We obtain an <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline14.png\\\"/> <jats:tex-math> $(r-2)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-iterated exponential lower bound to the Ramsey number of an <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline15.png\\\"/> <jats:tex-math> $(r,m,k)$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-daisy for <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline16.png\\\"/> <jats:tex-math> $2$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-colours. This matches the order of magnitude of the best lower bounds for the Ramsey number of a complete <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" mime-subtype=\\\"png\\\" xlink:href=\\\"S0963548324000208_inline17.png\\\"/> <jats:tex-math> $r$ </jats:tex-math> </jats:alternatives> </jats:inline-formula>-graph.\",\"PeriodicalId\":10503,\"journal\":{\"name\":\"Combinatorics, Probability and Computing\",\"volume\":\"1 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-09-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Combinatorics, Probability and Computing\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1017/s0963548324000208\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Combinatorics, Probability and Computing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1017/s0963548324000208","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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