{"title":"有界算子的加泰罗尼亚生成函数","authors":"Pedro J. Miana, Natalia Romero","doi":"10.1007/s43034-023-00290-0","DOIUrl":null,"url":null,"abstract":"<div><p>In this paper, we study the solution of the quadratic equation <span>\\(TY^2-Y+I=0\\)</span> where <i>T</i> is a linear and bounded operator on a Banach space <i>X</i>. We describe the spectrum set and the resolvent operator of <i>Y</i> in terms of the ones of <i>T</i>. In the case that 4<i>T</i> is a power-bounded operator, we show that a solution (named Catalan generating function) of the above equation is given by the Taylor series </p><div><div><span>$$\\begin{aligned} C(T):=\\sum _{n=0}^\\infty C_nT^n, \\end{aligned}$$</span></div></div><p>where the sequence <span>\\((C_n)_{n\\ge 0}\\)</span> is the well-known Catalan numbers sequence. We express <i>C</i>(<i>T</i>) by means of an integral representation which involves the resolvent operator <span>\\((\\lambda T)^{-1}\\)</span>. Some particular examples to illustrate our results are given, in particular an iterative method defined for square matrices <i>T</i> which involves Catalan numbers.</p></div>","PeriodicalId":48858,"journal":{"name":"Annals of Functional Analysis","volume":"14 4","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43034-023-00290-0.pdf","citationCount":"1","resultStr":"{\"title\":\"Catalan generating functions for bounded operators\",\"authors\":\"Pedro J. Miana, Natalia Romero\",\"doi\":\"10.1007/s43034-023-00290-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this paper, we study the solution of the quadratic equation <span>\\\\(TY^2-Y+I=0\\\\)</span> where <i>T</i> is a linear and bounded operator on a Banach space <i>X</i>. We describe the spectrum set and the resolvent operator of <i>Y</i> in terms of the ones of <i>T</i>. In the case that 4<i>T</i> is a power-bounded operator, we show that a solution (named Catalan generating function) of the above equation is given by the Taylor series </p><div><div><span>$$\\\\begin{aligned} C(T):=\\\\sum _{n=0}^\\\\infty C_nT^n, \\\\end{aligned}$$</span></div></div><p>where the sequence <span>\\\\((C_n)_{n\\\\ge 0}\\\\)</span> is the well-known Catalan numbers sequence. We express <i>C</i>(<i>T</i>) by means of an integral representation which involves the resolvent operator <span>\\\\((\\\\lambda T)^{-1}\\\\)</span>. Some particular examples to illustrate our results are given, in particular an iterative method defined for square matrices <i>T</i> which involves Catalan numbers.</p></div>\",\"PeriodicalId\":48858,\"journal\":{\"name\":\"Annals of Functional Analysis\",\"volume\":\"14 4\",\"pages\":\"\"},\"PeriodicalIF\":1.2000,\"publicationDate\":\"2023-07-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1007/s43034-023-00290-0.pdf\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Annals of Functional Analysis\",\"FirstCategoryId\":\"100\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s43034-023-00290-0\",\"RegionNum\":3,\"RegionCategory\":\"数学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATHEMATICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Annals of Functional Analysis","FirstCategoryId":"100","ListUrlMain":"https://link.springer.com/article/10.1007/s43034-023-00290-0","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATHEMATICS","Score":null,"Total":0}
Catalan generating functions for bounded operators
In this paper, we study the solution of the quadratic equation \(TY^2-Y+I=0\) where T is a linear and bounded operator on a Banach space X. We describe the spectrum set and the resolvent operator of Y in terms of the ones of T. In the case that 4T is a power-bounded operator, we show that a solution (named Catalan generating function) of the above equation is given by the Taylor series
where the sequence \((C_n)_{n\ge 0}\) is the well-known Catalan numbers sequence. We express C(T) by means of an integral representation which involves the resolvent operator \((\lambda T)^{-1}\). Some particular examples to illustrate our results are given, in particular an iterative method defined for square matrices T which involves Catalan numbers.
期刊介绍:
Annals of Functional Analysis is published by Birkhäuser on behalf of the Tusi Mathematical Research Group.
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