{"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}
引用次数: 0
Abstract
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.