馀度Turán紧环的密度减去一条边

Simón Piga, Marcelo Sales, Bjarne Schülke
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This improves a previous result by Balogh, Clemen, and Lidický.</p>","PeriodicalId":10503,"journal":{"name":"Combinatorics, Probability and Computing","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"The codegree Turán density of tight cycles minus one edge\",\"authors\":\"Simón Piga, Marcelo Sales, Bjarne Schülke\",\"doi\":\"10.1017/s0963548323000196\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Given <span><span><img data-mimesubtype=\\\"png\\\" data-type=\\\"\\\" src=\\\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231006153727984-0672:S0963548323000196:S0963548323000196_inline1.png\\\"><span data-mathjax-type=\\\"texmath\\\"><span>$\\\\alpha \\\\gt 0$</span></span></img></span></span> and an integer <span><span><img data-mimesubtype=\\\"png\\\" data-type=\\\"\\\" src=\\\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231006153727984-0672:S0963548323000196:S0963548323000196_inline2.png\\\"><span data-mathjax-type=\\\"texmath\\\"><span>$\\\\ell \\\\geq 5$</span></span></img></span></span>, we prove that every sufficiently large <span><span><img data-mimesubtype=\\\"png\\\" data-type=\\\"\\\" src=\\\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231006153727984-0672:S0963548323000196:S0963548323000196_inline3.png\\\"><span data-mathjax-type=\\\"texmath\\\"><span>$3$</span></span></img></span></span>-uniform hypergraph <span><span><img data-mimesubtype=\\\"png\\\" data-type=\\\"\\\" src=\\\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231006153727984-0672:S0963548323000196:S0963548323000196_inline4.png\\\"><span data-mathjax-type=\\\"texmath\\\"><span>$H$</span></span></img></span></span> on <span><span><img data-mimesubtype=\\\"png\\\" data-type=\\\"\\\" src=\\\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231006153727984-0672:S0963548323000196:S0963548323000196_inline5.png\\\"><span data-mathjax-type=\\\"texmath\\\"><span>$n$</span></span></img></span></span> vertices in which every two vertices are contained in at least <span><span><img data-mimesubtype=\\\"png\\\" data-type=\\\"\\\" src=\\\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231006153727984-0672:S0963548323000196:S0963548323000196_inline6.png\\\"><span data-mathjax-type=\\\"texmath\\\"><span>$\\\\alpha n$</span></span></img></span></span> edges contains a copy of <span><span><img data-mimesubtype=\\\"png\\\" data-type=\\\"\\\" src=\\\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231006153727984-0672:S0963548323000196:S0963548323000196_inline7.png\\\"><span data-mathjax-type=\\\"texmath\\\"><span>$C_\\\\ell ^{-}$</span></span></img></span></span>, a tight cycle on <span><span><img data-mimesubtype=\\\"png\\\" data-type=\\\"\\\" src=\\\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231006153727984-0672:S0963548323000196:S0963548323000196_inline8.png\\\"><span data-mathjax-type=\\\"texmath\\\"><span>$\\\\ell$</span></span></img></span></span> vertices minus one edge. 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引用次数: 1

摘要

给定$\alpha \gt 0$和一个整数$\ell \geq 5$,我们证明了$n$顶点上每一个足够大的$3$ -均匀超图$H$,其中每两个顶点至少包含$\alpha n$条边,其中包含$C_\ell ^{-}$的副本,即$\ell$顶点上的紧环减去一条边。这改进了先前由Balogh、Clemen和Lidický得出的结果。
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The codegree Turán density of tight cycles minus one edge

Given $\alpha \gt 0$ and an integer $\ell \geq 5$, we prove that every sufficiently large $3$-uniform hypergraph $H$ on $n$ vertices in which every two vertices are contained in at least $\alpha n$ edges contains a copy of $C_\ell ^{-}$, a tight cycle on $\ell$ vertices minus one edge. This improves a previous result by Balogh, Clemen, and Lidický.

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