求助PDF
{"title":"利用广义算术除数和函数及紧凑算子导出的新序列空间","authors":"Taja Yaying, Nipen Saikia, Mohammad Mursaleen","doi":"10.1515/forum-2023-0138","DOIUrl":null,"url":null,"abstract":"Define an infinite matrix <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo>=</m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msubsup> <m:mi>d</m:mi> <m:mrow> <m:mi>n</m:mi> <m:mo>,</m:mo> <m:mi>v</m:mi> </m:mrow> <m:mi>α</m:mi> </m:msubsup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0001.png\" /> <jats:tex-math>\\mathfrak{D}^{\\alpha}=(d^{\\alpha}_{n,v})</jats:tex-math> </jats:alternatives> </jats:inline-formula> by <jats:disp-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msubsup> <m:mi>d</m:mi> <m:mrow> <m:mi>n</m:mi> <m:mo>,</m:mo> <m:mi>v</m:mi> </m:mrow> <m:mi>α</m:mi> </m:msubsup> <m:mo>=</m:mo> <m:mrow> <m:mo>{</m:mo> <m:mtable columnspacing=\"5pt\" displaystyle=\"true\" rowspacing=\"0pt\"> <m:mtr> <m:mtd columnalign=\"left\"> <m:mrow> <m:mfrac> <m:msup> <m:mi>v</m:mi> <m:mi>α</m:mi> </m:msup> <m:mrow> <m:msup> <m:mi>σ</m:mi> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:mi>α</m:mi> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:msup> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:mi>n</m:mi> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:mfrac> <m:mo>,</m:mo> </m:mrow> </m:mtd> <m:mtd columnalign=\"left\"> <m:mrow> <m:mrow> <m:mi>v</m:mi> <m:mo>∣</m:mo> <m:mi>n</m:mi> </m:mrow> <m:mo>,</m:mo> </m:mrow> </m:mtd> </m:mtr> <m:mtr> <m:mtd columnalign=\"left\"> <m:mrow> <m:mn>0</m:mn> <m:mo>,</m:mo> </m:mrow> </m:mtd> <m:mtd columnalign=\"left\"> <m:mrow> <m:mrow> <m:mi>v</m:mi> <m:mo>∤</m:mo> <m:mi>n</m:mi> </m:mrow> <m:mo>,</m:mo> </m:mrow> </m:mtd> </m:mtr> </m:mtable> </m:mrow> </m:mrow> </m:math> <jats:graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_eq_9999.png\" /> <jats:tex-math>d^{\\alpha}_{n,v}=\\begin{cases}\\dfrac{v^{\\alpha}}{\\sigma^{(\\alpha)}(n)},&v\\mid n,\\\\ 0,&v\\nmid n,\\end{cases}</jats:tex-math> </jats:alternatives> </jats:disp-formula> where <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msup> <m:mi>σ</m:mi> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:mi>α</m:mi> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:msup> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:mi>n</m:mi> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0002.png\" /> <jats:tex-math>\\sigma^{(\\alpha)}(n)</jats:tex-math> </jats:alternatives> </jats:inline-formula> is defined to be the sum of the 𝛼-th power of the positive divisors of <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:mi>n</m:mi> <m:mo>∈</m:mo> <m:mi mathvariant=\"double-struck\">N</m:mi> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0003.png\" /> <jats:tex-math>n\\in\\mathbb{N}</jats:tex-math> </jats:alternatives> </jats:inline-formula>, and construct the matrix domains <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mi>p</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0004.png\" /> <jats:tex-math>\\ell_{p}(\\mathfrak{D}^{\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> (<jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:mn>0</m:mn> <m:mo><</m:mo> <m:mi>p</m:mi> <m:mo><</m:mo> <m:mi mathvariant=\"normal\">∞</m:mi> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0005.png\" /> <jats:tex-math>0<p<\\infty</jats:tex-math> </jats:alternatives> </jats:inline-formula>), <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0006.png\" /> <jats:tex-math>c_{0}(\\mathfrak{D}^{\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:mi>c</m:mi> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0007.png\" /> <jats:tex-math>c(\\mathfrak{D}^{\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mi mathvariant=\"normal\">∞</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0008.png\" /> <jats:tex-math>\\ell_{\\infty}(\\mathfrak{D}^{\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> defined by the matrix <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0009.png\" /> <jats:tex-math>\\mathfrak{D}^{\\alpha}</jats:tex-math> </jats:alternatives> </jats:inline-formula>. We develop Schauder bases and determine 𝛼-, 𝛽- and 𝛾-duals of these new spaces. We characterize some matrix transformation from <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mi>p</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0004.png\" /> <jats:tex-math>\\ell_{p}(\\mathfrak{D}^{\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0006.png\" /> <jats:tex-math>c_{0}(\\mathfrak{D}^{\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:mi>c</m:mi> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0007.png\" /> <jats:tex-math>c(\\mathfrak{D}^{\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mi mathvariant=\"normal\">∞</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0008.png\" /> <jats:tex-math>\\ell_{\\infty}(\\mathfrak{D}^{\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> to <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mi mathvariant=\"normal\">∞</m:mi> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0014.png\" /> <jats:tex-math>\\ell_{\\infty}</jats:tex-math> </jats:alternatives> </jats:inline-formula>, 𝑐, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0015.png\" /> <jats:tex-math>c_{0}</jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mn>1</m:mn> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0016.png\" /> <jats:tex-math>\\ell_{1}</jats:tex-math> </jats:alternatives> </jats:inline-formula>. Furthermore, we determine some criteria for compactness of an operator (or matrix) from <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:mi>X</m:mi> <m:mo>∈</m:mo> <m:mrow> <m:mo stretchy=\"false\">{</m:mo> <m:mrow> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mi>p</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> <m:mo>,</m:mo> <m:mrow> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> <m:mo>,</m:mo> <m:mrow> <m:mi>c</m:mi> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> <m:mo>,</m:mo> <m:mrow> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mi mathvariant=\"normal\">∞</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\"false\">(</m:mo> <m:msup> <m:mi mathvariant=\"fraktur\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\"false\">)</m:mo> </m:mrow> </m:mrow> <m:mo stretchy=\"false\">}</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0017.png\" /> <jats:tex-math>X\\in\\{\\ell_{p}(\\mathfrak{D}^{\\alpha}),c_{0}(\\mathfrak{D}^{\\alpha}),c(\\mathfrak{D}^{\\alpha}),\\ell_{\\infty}(\\mathfrak{D}^{\\alpha})\\}</jats:tex-math> </jats:alternatives> </jats:inline-formula> to <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mi mathvariant=\"normal\">∞</m:mi> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0014.png\" /> <jats:tex-math>\\ell_{\\infty}</jats:tex-math> </jats:alternatives> </jats:inline-formula>, 𝑐, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0015.png\" /> <jats:tex-math>c_{0}</jats:tex-math> </jats:alternatives> </jats:inline-formula> or <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:msub> <m:mi mathvariant=\"normal\">ℓ</m:mi> <m:mn>1</m:mn> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_forum-2023-0138_ineq_0016.png\" /> <jats:tex-math>\\ell_{1}</jats:tex-math> </jats:alternatives> </jats:inline-formula>.","PeriodicalId":12433,"journal":{"name":"Forum Mathematicum","volume":"1 1","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"New sequence spaces derived by using generalized arithmetic divisor sum function and compact operators\",\"authors\":\"Taja Yaying, Nipen Saikia, Mohammad Mursaleen\",\"doi\":\"10.1515/forum-2023-0138\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Define an infinite matrix <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo>=</m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msubsup> <m:mi>d</m:mi> <m:mrow> <m:mi>n</m:mi> <m:mo>,</m:mo> <m:mi>v</m:mi> </m:mrow> <m:mi>α</m:mi> </m:msubsup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0001.png\\\" /> <jats:tex-math>\\\\mathfrak{D}^{\\\\alpha}=(d^{\\\\alpha}_{n,v})</jats:tex-math> </jats:alternatives> </jats:inline-formula> by <jats:disp-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msubsup> <m:mi>d</m:mi> <m:mrow> <m:mi>n</m:mi> <m:mo>,</m:mo> <m:mi>v</m:mi> </m:mrow> <m:mi>α</m:mi> </m:msubsup> <m:mo>=</m:mo> <m:mrow> <m:mo>{</m:mo> <m:mtable columnspacing=\\\"5pt\\\" displaystyle=\\\"true\\\" rowspacing=\\\"0pt\\\"> <m:mtr> <m:mtd columnalign=\\\"left\\\"> <m:mrow> <m:mfrac> <m:msup> <m:mi>v</m:mi> <m:mi>α</m:mi> </m:msup> <m:mrow> <m:msup> <m:mi>σ</m:mi> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:mi>α</m:mi> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:msup> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:mi>n</m:mi> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:mfrac> <m:mo>,</m:mo> </m:mrow> </m:mtd> <m:mtd columnalign=\\\"left\\\"> <m:mrow> <m:mrow> <m:mi>v</m:mi> <m:mo>∣</m:mo> <m:mi>n</m:mi> </m:mrow> <m:mo>,</m:mo> </m:mrow> </m:mtd> </m:mtr> <m:mtr> <m:mtd columnalign=\\\"left\\\"> <m:mrow> <m:mn>0</m:mn> <m:mo>,</m:mo> </m:mrow> </m:mtd> <m:mtd columnalign=\\\"left\\\"> <m:mrow> <m:mrow> <m:mi>v</m:mi> <m:mo>∤</m:mo> <m:mi>n</m:mi> </m:mrow> <m:mo>,</m:mo> </m:mrow> </m:mtd> </m:mtr> </m:mtable> </m:mrow> </m:mrow> </m:math> <jats:graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_eq_9999.png\\\" /> <jats:tex-math>d^{\\\\alpha}_{n,v}=\\\\begin{cases}\\\\dfrac{v^{\\\\alpha}}{\\\\sigma^{(\\\\alpha)}(n)},&v\\\\mid n,\\\\\\\\ 0,&v\\\\nmid n,\\\\end{cases}</jats:tex-math> </jats:alternatives> </jats:disp-formula> where <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msup> <m:mi>σ</m:mi> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:mi>α</m:mi> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:msup> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:mi>n</m:mi> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0002.png\\\" /> <jats:tex-math>\\\\sigma^{(\\\\alpha)}(n)</jats:tex-math> </jats:alternatives> </jats:inline-formula> is defined to be the sum of the 𝛼-th power of the positive divisors of <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:mi>n</m:mi> <m:mo>∈</m:mo> <m:mi mathvariant=\\\"double-struck\\\">N</m:mi> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0003.png\\\" /> <jats:tex-math>n\\\\in\\\\mathbb{N}</jats:tex-math> </jats:alternatives> </jats:inline-formula>, and construct the matrix domains <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mi>p</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0004.png\\\" /> <jats:tex-math>\\\\ell_{p}(\\\\mathfrak{D}^{\\\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> (<jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:mn>0</m:mn> <m:mo><</m:mo> <m:mi>p</m:mi> <m:mo><</m:mo> <m:mi mathvariant=\\\"normal\\\">∞</m:mi> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0005.png\\\" /> <jats:tex-math>0<p<\\\\infty</jats:tex-math> </jats:alternatives> </jats:inline-formula>), <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0006.png\\\" /> <jats:tex-math>c_{0}(\\\\mathfrak{D}^{\\\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:mi>c</m:mi> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0007.png\\\" /> <jats:tex-math>c(\\\\mathfrak{D}^{\\\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mi mathvariant=\\\"normal\\\">∞</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0008.png\\\" /> <jats:tex-math>\\\\ell_{\\\\infty}(\\\\mathfrak{D}^{\\\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> defined by the matrix <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0009.png\\\" /> <jats:tex-math>\\\\mathfrak{D}^{\\\\alpha}</jats:tex-math> </jats:alternatives> </jats:inline-formula>. We develop Schauder bases and determine 𝛼-, 𝛽- and 𝛾-duals of these new spaces. We characterize some matrix transformation from <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mi>p</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0004.png\\\" /> <jats:tex-math>\\\\ell_{p}(\\\\mathfrak{D}^{\\\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0006.png\\\" /> <jats:tex-math>c_{0}(\\\\mathfrak{D}^{\\\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:mi>c</m:mi> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0007.png\\\" /> <jats:tex-math>c(\\\\mathfrak{D}^{\\\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mi mathvariant=\\\"normal\\\">∞</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0008.png\\\" /> <jats:tex-math>\\\\ell_{\\\\infty}(\\\\mathfrak{D}^{\\\\alpha})</jats:tex-math> </jats:alternatives> </jats:inline-formula> to <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mi mathvariant=\\\"normal\\\">∞</m:mi> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0014.png\\\" /> <jats:tex-math>\\\\ell_{\\\\infty}</jats:tex-math> </jats:alternatives> </jats:inline-formula>, 𝑐, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0015.png\\\" /> <jats:tex-math>c_{0}</jats:tex-math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mn>1</m:mn> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0016.png\\\" /> <jats:tex-math>\\\\ell_{1}</jats:tex-math> </jats:alternatives> </jats:inline-formula>. Furthermore, we determine some criteria for compactness of an operator (or matrix) from <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:mrow> <m:mi>X</m:mi> <m:mo>∈</m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">{</m:mo> <m:mrow> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mi>p</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> <m:mo>,</m:mo> <m:mrow> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> <m:mo>,</m:mo> <m:mrow> <m:mi>c</m:mi> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> <m:mo>,</m:mo> <m:mrow> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mi mathvariant=\\\"normal\\\">∞</m:mi> </m:msub> <m:mo></m:mo> <m:mrow> <m:mo stretchy=\\\"false\\\">(</m:mo> <m:msup> <m:mi mathvariant=\\\"fraktur\\\">D</m:mi> <m:mi>α</m:mi> </m:msup> <m:mo stretchy=\\\"false\\\">)</m:mo> </m:mrow> </m:mrow> <m:mo stretchy=\\\"false\\\">}</m:mo> </m:mrow> </m:mrow> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0017.png\\\" /> <jats:tex-math>X\\\\in\\\\{\\\\ell_{p}(\\\\mathfrak{D}^{\\\\alpha}),c_{0}(\\\\mathfrak{D}^{\\\\alpha}),c(\\\\mathfrak{D}^{\\\\alpha}),\\\\ell_{\\\\infty}(\\\\mathfrak{D}^{\\\\alpha})\\\\}</jats:tex-math> </jats:alternatives> </jats:inline-formula> to <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mi mathvariant=\\\"normal\\\">∞</m:mi> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0014.png\\\" /> <jats:tex-math>\\\\ell_{\\\\infty}</jats:tex-math> </jats:alternatives> </jats:inline-formula>, 𝑐, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:msub> <m:mi>c</m:mi> <m:mn>0</m:mn> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0015.png\\\" /> <jats:tex-math>c_{0}</jats:tex-math> </jats:alternatives> </jats:inline-formula> or <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\\\"http://www.w3.org/1998/Math/MathML\\\"> <m:msub> <m:mi mathvariant=\\\"normal\\\">ℓ</m:mi> <m:mn>1</m:mn> </m:msub> </m:math> <jats:inline-graphic xmlns:xlink=\\\"http://www.w3.org/1999/xlink\\\" xlink:href=\\\"graphic/j_forum-2023-0138_ineq_0016.png\\\" /> <jats:tex-math>\\\\ell_{1}</jats:tex-math> </jats:alternatives> </jats:inline-formula>.\",\"PeriodicalId\":12433,\"journal\":{\"name\":\"Forum Mathematicum\",\"volume\":\"1 1\",\"pages\":\"\"},\"PeriodicalIF\":1.0000,\"publicationDate\":\"2024-03-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Forum Mathematicum\",\"FirstCategoryId\":\"100\",\"ListUrlMain\":\"https://doi.org/10.1515/forum-2023-0138\",\"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":"Forum Mathematicum","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.1515/forum-2023-0138","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 0
引用
批量引用
摘要
通过 d n , v α = { v α σ ( α ) ( n ) 定义一个无穷矩阵 D α = ( d n , v α ) \mathfrak{D}^{\alpha}=(d^{\alpha}_{n,v}) 、 v ∣ n , 0 , v ∤ n , d^{\alpha}_{n,v}=\begin{cases}\dfrac{v^{\alpha}}\{sigma^{(\alpha)}(n)},&;v\mid n,(0,&;v\nmid n,end{cases} 其中 σ ( α ) ( n ) \sigma^{(\alpha)}(n) 被定义为 n∈ N n\in\mathbb{N} 的正除数的𝛼次幂之和,并构造矩阵域 ℓ p ( D α ) \ell_{p}(\mathfrak{D}^\{alpha}) ( 0 <;p < ∞ 0<p<;\infty ), c 0 ( D α ) c_{0}(\mathfrak{D}^{\alpha}) , c ( D α ) c(\mathfrak{D}^{\alpha}) 和 ℓ ∞ ( D α ) \ell_{\infty}(\mathfrak{D}^{\alpha}) 由矩阵 D α \mathfrak{D}^{\alpha} 定义。我们建立了 Schauder 基,并确定了这些新空间的 𝛼-、 𝛼-和 𝛾-对偶。我们描述了从ℓ p ( D α ) \ell_{p}(\mathfrak{D}^{\alpha}) , c 0 ( D α ) c_{0}(\mathfrak{D}^{\alpha}) 的矩阵变换、 c ( D α ) c(\mathfrak{D}^{\alpha}) and ℓ ∞ ( D α ) \ell_{\infty}(\mathfrak{D}^{\alpha}) to ℓ ∞ \ell_{\infty} , 𝑐, c 0 c_{0} 和 ℓ 1 \ell_{1} 。此外,我们还确定了 X∈ { ℓ p ( D α ) , c 0 ( D α ) , c ( D α ) , ℓ ∞ ( D α ) } 的算子(或矩阵)紧凑性的一些标准。 X\in\{\ell_{p}(\mathfrak{D}^{\alpha}),c_{0}(\mathfrak{D}^{\alpha}),c(\mathfrak{D}^{\alpha}),\ell_{\infty}(\mathfrak{D}^{\alpha})\} to ℓ ∞ \ell_{\infty} , 𝑐, c 0 c_{0} 或 ℓ 1 \ell_{1} .
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New sequence spaces derived by using generalized arithmetic divisor sum function and compact operators
Define an infinite matrix D α = ( d n , v α ) \mathfrak{D}^{\alpha}=(d^{\alpha}_{n,v}) by d n , v α = { v α σ ( α ) ( n ) , v ∣ n , 0 , v ∤ n , d^{\alpha}_{n,v}=\begin{cases}\dfrac{v^{\alpha}}{\sigma^{(\alpha)}(n)},&v\mid n,\\ 0,&v\nmid n,\end{cases} where σ ( α ) ( n ) \sigma^{(\alpha)}(n) is defined to be the sum of the 𝛼-th power of the positive divisors of n ∈ N n\in\mathbb{N} , and construct the matrix domains ℓ p ( D α ) \ell_{p}(\mathfrak{D}^{\alpha}) ( 0 < p < ∞ 0<p<\infty ), c 0 ( D α ) c_{0}(\mathfrak{D}^{\alpha}) , c ( D α ) c(\mathfrak{D}^{\alpha}) and ℓ ∞ ( D α ) \ell_{\infty}(\mathfrak{D}^{\alpha}) defined by the matrix D α \mathfrak{D}^{\alpha} . We develop Schauder bases and determine 𝛼-, 𝛽- and 𝛾-duals of these new spaces. We characterize some matrix transformation from ℓ p ( D α ) \ell_{p}(\mathfrak{D}^{\alpha}) , c 0 ( D α ) c_{0}(\mathfrak{D}^{\alpha}) , c ( D α ) c(\mathfrak{D}^{\alpha}) and ℓ ∞ ( D α ) \ell_{\infty}(\mathfrak{D}^{\alpha}) to ℓ ∞ \ell_{\infty} , 𝑐, c 0 c_{0} and ℓ 1 \ell_{1} . Furthermore, we determine some criteria for compactness of an operator (or matrix) from X ∈ { ℓ p ( D α ) , c 0 ( D α ) , c ( D α ) , ℓ ∞ ( D α ) } X\in\{\ell_{p}(\mathfrak{D}^{\alpha}),c_{0}(\mathfrak{D}^{\alpha}),c(\mathfrak{D}^{\alpha}),\ell_{\infty}(\mathfrak{D}^{\alpha})\} to ℓ ∞ \ell_{\infty} , 𝑐, c 0 c_{0} or ℓ 1 \ell_{1} .