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2019 Fiscal Year Annual Research Report

Development around various type entropy as well as operator algebraic basic research on measurable dynamical system and topological dynamical system

Research Project

Project/Area Number 15K04910
Research InstitutionKanagawa University

Principal Investigator

長 宗雄  神奈川大学, 理学部, 教授 (10091620)

Project Period (FY) 2015-04-01 – 2020-03-31
KeywordsEntropy / Hilbert space / Operator Theory / spectrum / dynamical system / Banach space
Outline of Annual Research Achievements

2015年度から2019年度までの期間で研究を進めている「各種エントロピーを巡る展開および可測力学系と位相力学系との作用素論的基礎研究」について、2019年度は本研究の最後の年であったため、これまでの研究結果を論文として纏めることと研究成果の発表を積極的に進めた。次に列挙するように研究はおおむね成果をあげることができた。研究発表としては6月21日から24日の間に東洋大学で開催された国際研究集会The Fifteenth Workshop on Numerical Ranges and Numerical Radii において22日に「Numerical ranges of Banach space operators」題名で研究発表を行った。6月27日から6月29日の間で開催された国際研究集会 KOTAC2019に参加し、27日には「UCP maps arising from operator algebra inclusions」の題名で長田まりゑが講演を行い、棚橋浩太郎は「On n-normal operators and others」の題名で研究発表、また28日には長宗雄が「Numerical range of a Banach space operator」の題名で研究発表を行った。10月23日から24日の間に京都大学数理解析研究所で開催された研究集会「順序を用いた作用素の構造研究と関連する話題」に参加し、23日に長宗雄は「Approximate point spectra of m-complex symmetric operators and others」及び「Remarks on conjugation and antilinear operators and their numerical range」の題名2つを発表し、24日には棚橋浩太郎が「クラス p-wA(s,t) 作用素上の spectral continuity」の題名で研究発表を行った。さらに Banach 空間上の conjugation について研究を進めている。

  • Research Products

    (14 results)

All 2020 2019

All Journal Article (8 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 8 results,  Open Access: 3 results) Presentation (6 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] On operators T commuting with CTC where C is a conjugation2020

    • Author(s)
      M. Cho, E. Ko, J.E. Lee
    • Journal Title

      Bull. Korean Math. Soc.

      Volume: 57 Pages: 69-79

    • DOI

      10.4134/BKMS.b190054

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On the approximate point spectra of m-complex symmetric operators, [m,C]-symmetric operators and others2019

    • Author(s)
      M. Cho, J.E. Lee, B. Nacevska Nastovska, T. Saito
    • Journal Title

      Functional Analysis, Application Computation

      Volume: 11(1) Pages: 11-20

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Fuglede-Putnam Theorem and quasisimilarity of class p-wA(s,t) operators2019

    • Author(s)
      M. Cho, T. Prasad, M.H.M. Rashid, K. Tanahashi, A. Uchiyama
    • Journal Title

      Operators and Matrices

      Volume: 13 Pages: 293-299

    • DOI

      10.7153/oam-2019-13-19

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Class p-wA(s,t) operators and range kernel orthogonality2019

    • Author(s)
      M. Cho, T. Prasad, M.H.M. Rashid, K. Tanahashi, A. Uchiyama
    • Journal Title

      Sci. Math. Japon

      Volume: 82 Pages: 45-55

    • DOI

      10.32219/isms.82.1_45

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Complex symmetric operators and isotopic vectors on Banach spaces2019

    • Author(s)
      M. Cho, Injo Hur, J.E. Lee
    • Journal Title

      J. Math. Anal. Appl.

      Volume: 479 Pages: 752-764

    • DOI

      10.1016/j.jmaa.2019.06.049

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] (A,m)-symmetric commuting tuples of operators on a Hilbert space2019

    • Author(s)
      M. Cho, O.A.M.Sid Ahmd
    • Journal Title

      Math. Ineq. Appl.

      Volume: 22 Pages: 931-947

    • DOI

      10.7153/mia-2019-22-63

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Skew m-complex symmetric operators2019

    • Author(s)
      M. Cho, E. Ko, J.E. Lee
    • Journal Title

      Filomat

      Volume: 33 Pages: 2975-2983

    • DOI

      https://doi.org/10.2298/FIL1910975C

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spectral properties of square hyponormal operators2019

    • Author(s)
      M. Cho, D. Mosic, B. Nacevska Nastovska, T. Saito
    • Journal Title

      Filomat

      Volume: 33-15 Pages: 4845-4854

    • DOI

      10.2298/FIL1915845C

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Numerical ranges of Banach space operators2019

    • Author(s)
      M. Cho
    • Organizer
      The fifteenth workshop on numerical ranges and numerical radii
    • Int'l Joint Research
  • [Presentation] On n-normal operators and others2019

    • Author(s)
      M. Cho
    • Organizer
      KOTAC2019
    • Int'l Joint Research
  • [Presentation] Numerical ranges of a Banach space operator2019

    • Author(s)
      M. Cho
    • Organizer
      KOTAC2019
    • Int'l Joint Research
  • [Presentation] Approximate point spectra of m-complex symmetric operators and others2019

    • Author(s)
      M. Cho
    • Organizer
      順序を用いた作用素の構造研究と関連する話題
  • [Presentation] Remarks on conjugation and antilinear operators and their numerical range2019

    • Author(s)
      M. Cho
    • Organizer
      順序を用いた作用素の構造研究と関連する話題
  • [Presentation] クラス p-wA(s,t) 作用素上の spectral continuity2019

    • Author(s)
      K. Tanahashi
    • Organizer
      順序を用いた作用素の構造研究と関連する話題

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Published: 2021-01-27  

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