{"title":"关于希尔伯特空间中一些算子变换的新结果","authors":"Najla Altwaijry, Cristian Conde, Kais Feki, Hranislav Stanković","doi":"10.1007/s00574-024-00416-5","DOIUrl":null,"url":null,"abstract":"<p>In this paper, we explore various transforms associated with a bounded linear operator <i>T</i> on a Hilbert space. These transforms include the Aluthge, <span>\\(\\lambda \\)</span>-Aluthge, Duggal, generalized mean, and <span>\\(\\lambda \\)</span>-mean transforms. Our aim is to investigate the connections between <i>T</i> and these transforms, focusing on aspects such as norm inequalities and numerical ranges, while also highlighting certain essential properties. Furthermore, we aim to determine the conditions under which an operator <i>T</i> coincides in norm with its transformed counterparts through these transformations. Several characterizations and properties are also derived.</p>","PeriodicalId":501417,"journal":{"name":"Bulletin of the Brazilian Mathematical Society, New Series","volume":"5 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"New Results on Some Transforms of Operators in Hilbert Spaces\",\"authors\":\"Najla Altwaijry, Cristian Conde, Kais Feki, Hranislav Stanković\",\"doi\":\"10.1007/s00574-024-00416-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>In this paper, we explore various transforms associated with a bounded linear operator <i>T</i> on a Hilbert space. These transforms include the Aluthge, <span>\\\\(\\\\lambda \\\\)</span>-Aluthge, Duggal, generalized mean, and <span>\\\\(\\\\lambda \\\\)</span>-mean transforms. Our aim is to investigate the connections between <i>T</i> and these transforms, focusing on aspects such as norm inequalities and numerical ranges, while also highlighting certain essential properties. Furthermore, we aim to determine the conditions under which an operator <i>T</i> coincides in norm with its transformed counterparts through these transformations. Several characterizations and properties are also derived.</p>\",\"PeriodicalId\":501417,\"journal\":{\"name\":\"Bulletin of the Brazilian Mathematical Society, New Series\",\"volume\":\"5 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-08-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of the Brazilian Mathematical Society, New Series\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1007/s00574-024-00416-5\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Brazilian Mathematical Society, New Series","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s00574-024-00416-5","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
在本文中,我们探讨了与希尔伯特空间上有界线性算子 T 相关的各种变换。这些变换包括 Aluthge、(\lambda \)-Aluthge、Duggal、广义均值和(\lambda \)-均值变换。我们的目的是研究 T 与这些变换之间的联系,重点是规范不等式和数值范围等方面,同时也强调某些基本性质。此外,我们还旨在确定在哪些条件下,算子 T 通过这些变换与其变换后的对应算子在规范上重合。我们还得出了一些特征和性质。
New Results on Some Transforms of Operators in Hilbert Spaces
In this paper, we explore various transforms associated with a bounded linear operator T on a Hilbert space. These transforms include the Aluthge, \(\lambda \)-Aluthge, Duggal, generalized mean, and \(\lambda \)-mean transforms. Our aim is to investigate the connections between T and these transforms, focusing on aspects such as norm inequalities and numerical ranges, while also highlighting certain essential properties. Furthermore, we aim to determine the conditions under which an operator T coincides in norm with its transformed counterparts through these transformations. Several characterizations and properties are also derived.