{"title":"浸入式流形的并发法线","authors":"G. Panina, D. Siersma","doi":"10.46298/cm.10840","DOIUrl":null,"url":null,"abstract":"It is conjectured since long that for any convex body $K \\subset\n\\mathbb{R}^n$ there exists a point in the interior of $K$ which belongs to at\nleast $2n$ normals from different points on the boundary of $K$. The conjecture\nis known to be true for $n=2,3,4$.\n Motivated by a recent results of Y. Martinez-Maure, and an approach by A.\nGrebennikov and G. Panina, we prove the following: Let a compact smooth\n$m$-dimensional manifold $M^m$ be immersed in $ \\mathbb{R}^n$. We assume that\nat least one of the homology groups $H_k(M^m,\\mathbb{Z}_2)$ with $k<m$\nvanishes. Then under mild conditions, almost every normal line to $M^m$\ncontains an intersection point of at least $\\beta +4$ normals from different\npoints of $M^m$, where $\\beta$ is the sum of Betti numbers of $M^m$.","PeriodicalId":37836,"journal":{"name":"Communications in Mathematics","volume":" ","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Concurrent normals of immersed manifolds\",\"authors\":\"G. Panina, D. Siersma\",\"doi\":\"10.46298/cm.10840\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"It is conjectured since long that for any convex body $K \\\\subset\\n\\\\mathbb{R}^n$ there exists a point in the interior of $K$ which belongs to at\\nleast $2n$ normals from different points on the boundary of $K$. The conjecture\\nis known to be true for $n=2,3,4$.\\n Motivated by a recent results of Y. Martinez-Maure, and an approach by A.\\nGrebennikov and G. Panina, we prove the following: Let a compact smooth\\n$m$-dimensional manifold $M^m$ be immersed in $ \\\\mathbb{R}^n$. We assume that\\nat least one of the homology groups $H_k(M^m,\\\\mathbb{Z}_2)$ with $k<m$\\nvanishes. Then under mild conditions, almost every normal line to $M^m$\\ncontains an intersection point of at least $\\\\beta +4$ normals from different\\npoints of $M^m$, where $\\\\beta$ is the sum of Betti numbers of $M^m$.\",\"PeriodicalId\":37836,\"journal\":{\"name\":\"Communications in Mathematics\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-01-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Communications in Mathematics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.46298/cm.10840\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"Mathematics\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Communications in Mathematics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.46298/cm.10840","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Mathematics","Score":null,"Total":0}
引用次数: 0
摘要
长久以来,我们推测对于任何凸体$K \子集$ mathbb{R}^n$,在$K$的内部存在一个点,该点至少属于$K$边界上不同点的$2n$法线。这个猜想对于n=2,3,4是成立的。根据Y. Martinez-Maure最近的结果,以及a . grebennikov和G. Panina的一种方法,我们证明了以下问题:设一个紧化光滑$m$维流形$m ^m$浸入$ \mathbb{R}^n$中。我们假设在k< M的同调群$H_k(M^ M,\mathbb{Z}_2)$中至少有一个不存在。然后在温和的条件下,几乎每条到$M^ M $的法线都包含至少$\beta +4$从$M^ M $的不同点来的法线的交点,其中$\beta$是$M^ M $的贝蒂数之和。
It is conjectured since long that for any convex body $K \subset
\mathbb{R}^n$ there exists a point in the interior of $K$ which belongs to at
least $2n$ normals from different points on the boundary of $K$. The conjecture
is known to be true for $n=2,3,4$.
Motivated by a recent results of Y. Martinez-Maure, and an approach by A.
Grebennikov and G. Panina, we prove the following: Let a compact smooth
$m$-dimensional manifold $M^m$ be immersed in $ \mathbb{R}^n$. We assume that
at least one of the homology groups $H_k(M^m,\mathbb{Z}_2)$ with $k
期刊介绍:
Communications in Mathematics publishes research and survey papers in all areas of pure and applied mathematics. To be acceptable for publication, the paper must be significant, original and correct. High quality review papers of interest to a wide range of scientists in mathematics and its applications are equally welcome.