• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

A study of geometric structure of Banach spaces and its applications

Research Project

Project/Area Number 15K04920
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Basic analysis
Research InstitutionNiigata University

Principal Investigator

SAITO KICHI-SUKE  新潟大学, 自然科学系, フェロー (30018949)

Co-Investigator(Kenkyū-buntansha) 加藤 幹雄  信州大学, 工学部, 非常勤講師 (50090551)
三谷 健一  岡山県立大学, 情報工学部, 准教授 (00468969)
渡邉 恵一  新潟大学, 自然科学系, 教授 (50210894)
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsバナッハ空間 / James定数 / Birkhoff直交 / Radon空間 / 幾何学定数 / von Neumann-Jordan定数 / absoluteノルム / π/2回転不変ノルム / Becknerの不等式
Outline of Final Research Achievements

In the study of geometry of Banach spaces, two notions of orthogonality and geometric constant are important. First, we sucessed to characterize 2 dimensional Banach spaces with James constant √2. We published three papers (Math Nach, Mediter J Math, Math Inequal Appl) about this results. In the study of symmetry of Banach spaces, we studied the symmetric points of von Neumann algebras and so on. In particular, we characterized symmetric 2-dimmensional Banach spaces using generalized Day-James spaces.

Academic Significance and Societal Importance of the Research Achievements

バナッハ空間における幾何学構造について、特に、2次元空間の構造がまだ解明されていなかったが、absoluteノルム空間の概念を用いて、その解明に成功した。それにより、抽象的だった、Radon空間がDay-James 空間を用いて、特徴付けしたことには、大きな意義がある。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (85 results)

All 2019 2018 2017 2016 2015

All Journal Article (49 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 38 results,  Open Access: 11 results,  Acknowledgement Compliant: 20 results) Presentation (36 results) (of which Int'l Joint Research: 9 results,  Invited: 5 results)

  • [Journal Article] On symmetry of Birkhoff orthogonality in the positive cones of C*-algebras with applications2019

    • Author(s)
      Komuro Naoto、Kichi-Suke Saito、 Ryotaro Tanaka
    • Journal Title

      J. Math. Anal. Appl.

      Volume: 474 Issue: 2 Pages: 1488-1497

    • DOI

      10.1016/j.jmaa.2019.02.033

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A characterization of Radon planes using generalized Day-James spaces2019

    • Author(s)
      Komuro Naoto、Kichi-Suke Saito、 Ryotaro Tanaka
    • Journal Title

      Ann. Funct. Anal.

      Volume: ---

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The fixed point property of A-direct sums of N uniformly non-square Banach spaces2019

    • Author(s)
      Takayuki Tamura, Mikio Kato
    • Journal Title

      数理研講究禄

      Volume: 2114

    • Related Report
      2018 Annual Research Report
    • Open Access
  • [Journal Article] Symmetric points for (strong) Birkhoff orthogonality in von Neumann algebras with applications to preserver problems2018

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      J. Math. Anal. Appl.

      Volume: 463 Issue: 2 Pages: 1109-1131

    • DOI

      10.1016/j.jmaa.2018.03.068

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A sufficient condition that J(X*) = J(X) holds for a Banach space X2018

    • Author(s)
      Komuro Naoto、Kichi-Suke Saito、 Ryotaro Tanaka
    • Journal Title

      Tokyo J. Math.

      Volume: 41 Pages: 219-223

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Left symmetric points for Birkhoff orthogonality in the preduals of von Neumann algebras2018

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Bull. Aust. Math. Soc.

      Volume: 98 Issue: 3 Pages: 494-501

    • DOI

      10.1017/s0004972718000849

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characteristic properties of Banach spaces with James constant √22018

    • Author(s)
      Komuro Naoto、Kichi-Suke Saito、 Ryotaro Tanaka
    • Journal Title

      J. Nonlinear Convex Analysis

      Volume: 19 Pages: 1665-1673

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On von Neumann-Jordan constant of l_p-l_q spaces2018

    • Author(s)
      Ken-Ichi Mitani, Yasuji Takahashi, Kichi-Suke Saito
    • Journal Title

      J. Nonlinear Convex Anal.

      Volume: 19 Pages: 1705-1709

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Von Neumann-Jordan constant of generalized Banas-Fraczek spaces2018

    • Author(s)
      三谷 健一, 斎藤 吉助, 高橋 泰嗣
    • Journal Title

      数理研講究禄

      Volume: 2095 Pages: 198-202

    • Related Report
      2018 Annual Research Report
    • Open Access
  • [Journal Article] On the structure of Banach spaces with James constant √22018

    • Author(s)
      斎藤 吉助, 小室 直人, 田中 亮太朗
    • Journal Title

      数理研講究禄

      Volume: 2073 Pages: 72-79

    • Related Report
      2018 Annual Research Report
    • Open Access
  • [Journal Article] Rotation invariant norms on R2 and geometric constants2018

    • Author(s)
      斎藤 吉助, 小室 直人, 田中 亮太朗
    • Journal Title

      数理研講究禄

      Volume: 2065 Pages: 94-99

    • Related Report
      2018 Annual Research Report
    • Open Access
  • [Journal Article] Some results on direct sums of Banach spaces --- A survey2018

    • Author(s)
      Mikio Kato, Takuya Sobukawa and Takayuki Tamura
    • Journal Title

      Scientiae Mathematicae Japonicae

      Volume: 81 Pages: 279-292

    • NAID

      130007644562

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Symmetric points for (strong) Birkhoff orthogonality in von Neumann algebras with applications to preserver problems2018

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      J. Math. Anal. Appl.

      Volume: 463 Pages: 1109-1131

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] A sufficient condition that J(X^*) = J(X) holds for a Banach space X2018

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Tokyo J. Math.

      Volume: ---

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] New geometric notions of Banach spaces using ψ-direct sums2017

    • Author(s)
      Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Linear and Nonlinear Analysis

      Volume: 3 Pages: 311-320

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] A comparison between James and von Neumann-Jordan constants2017

    • Author(s)
      Naoto Komuro,Ken-Ichi Mitani, Kichi-Suke Saito, Ryotaro Tanaka, Yukino Tomizawa
    • Journal Title

      Mediterr. J. Math.

      Volume: 14

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] On the class of Banach spaces with James constant √2 III2017

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Math. Inequal. Appl.

      Volume: 20 Pages: 865-887

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Geometric constants of π/2-rotation invariant norms on R^22017

    • Author(s)
      Yukino Tomizawa, Ken-Ichi Mitani, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Ann Funct. Anal.

      Volume: 8 Pages: 215-230

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 最良のJames定数を持つバナッハ空間の特徴付けとそのLassak問題への応用2017

    • Author(s)
      田中 亮太朗, 斎藤 吉助, 小室 直人
    • Journal Title

      数理研講究禄

      Volume: 2041 Pages: 84-91

    • Related Report
      2017 Research-status Report
  • [Journal Article] 2次元ローレンツ空間のJames定数についての最近の発展2017

    • Author(s)
      斎藤 吉助, 田中 亮太朗, 三谷 健一
    • Journal Title

      数理研講究禄

      Volume: 2041 Pages: 77-83

    • Related Report
      2017 Research-status Report
  • [Journal Article] Von Neumann-Jordan constant of l_p-l_q2017

    • Author(s)
      三谷 健一, 斎藤 吉助, 高橋 泰嗣
    • Journal Title

      数理研講究禄

      Volume: 2033 Pages: 101-105

    • Related Report
      2017 Research-status Report
  • [Journal Article] Geometric constants of Banach spaces and the matrix norms2017

    • Author(s)
      斎藤 吉助, 小室 直人, 田中 亮太朗
    • Journal Title

      数理研講究禄

      Volume: 2033 Pages: 101-105

    • Related Report
      2017 Research-status Report
  • [Journal Article] On the class of Banach spaces with James constant √2 III2017

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Math Inequal Appl

      Volume: 印刷中

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] A sufficient condition that J(X^*)=J(X) holds for a Banach space X2017

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Tokyo J. Math.

      Volume: 印刷中

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Geometric constants of π/2-rotation invariant norms on R^22017

    • Author(s)
      Yukino Tomizawa, Ken-Ichi Mitani, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Ann. Funct. Anal.

      Volume: 8 Pages: 215-230

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] On the von Neumann-Jordan constant of generalied Banas-Fraczek spaces2016

    • Author(s)
      Ken-Ichi Mitani, Yasuji Takahashi, Kichi-Suke Saito
    • Journal Title

      Linear and Nonlinear Analysis

      Volume: 2 Pages: 311-316

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] On the class of Banach spaces with James constant √2 PartII2016

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Mediter J Math

      Volume: 13 Issue: 6 Pages: 4039-4061

    • DOI

      10.1007/s00009-016-0731-7

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Dual of extremal absolute norms on R^2 and the James constant2016

    • Author(s)
      Masahiro Sato, Naoto Komuro, Ken-Ichi Mitani, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Banach J. Math. Anal.

      Volume: 10 Pages: 251-266

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] On the upper bound of some geometric constants of absolute normalized norms on R^22016

    • Author(s)
      Hiroyasu Mizuguchi, Kichi-Suke Saito
    • Journal Title

      Mediterranean Journal of Mathematics

      Volume: 13 Issue: 1 Pages: 309-322

    • DOI

      10.1007/s00009-014-0485-z

    • Related Report
      2016 Research-status Report 2015 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Note on Dunkl-Williams inequality with n elements2016

    • Author(s)
      Ken-Ichi Mitani, Noriyuki Tabiraki, Tomoyoshi Ohwada
    • Journal Title

      Nihonkai Mathematical Journal

      Volume: 27 Pages: 125-133

    • Related Report
      2016 Research-status Report 2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] Dual of extremal absolute norms on R^2 and the James constant2016

    • Author(s)
      Masahiro Sato, Naoto Komuro, Ken-ichi Mitani, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Banach J. Math. Anal.

      Volume: 10 Pages: 251-266

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Another approach of extreme norms on R^22016

    • Author(s)
      Shunpei Yokoyama, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      J. Nonlinear Convex Analysis

      Volume: 17 Pages: 157-165

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] On the class of Banach spaces with James constant √22015

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Math. Nach.

      Volume: --- Issue: 8-9 Pages: 1-16

    • DOI

      10.1002/mana.201500238

    • Related Report
      2016 Research-status Report 2015 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] On the convexity of von Neumann-Jordan constant2015

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ken-ichi Mitani, Ryotaro Tanaka
    • Journal Title

      J. Nonlinear Convex Analysis

      Volume: 16 Pages: 2263-2277

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] On James constants of two dimensional Lorentz sequence spaces and its dual2015

    • Author(s)
      Ken-Ichi Mitani, Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      J. Nonlinear Convex Analysis

      Volume: 16 Pages: 2269-2277

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Extremal structure of absolute normalized norms and the skewness2015

    • Author(s)
      Ken-ichi Mitani, Kichi-Suke Saito, Naoto Komuro
    • Journal Title

      Linear and Nonlinear Analysis

      Volume: 1 Pages: 159-167

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] When does the equality J(X^*) = J(X) holds?2015

    • Author(s)
      Kichi-Suke Saito, Masahiro Sato, Ryotaro Tanaka
    • Journal Title

      Acta Math. Sinica, (English serires)

      Volume: 31 Issue: 8 Pages: 1303-1314

    • DOI

      10.1007/s10114-015-4539-3

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] New geometric properties of Banach spaces2015

    • Author(s)
      Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Math. Nach.

      Volume: 288 Issue: 10 Pages: 1163-1178

    • DOI

      10.1002/mana.201400180

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Recent progress on Beckner inequalities2015

    • Author(s)
      Ryotaro Tanaka, Kichi-Suke Saito
    • Journal Title

      Proc. 8th International Conference on Nonlinear Analysis and Convex Analysis

      Volume: --- Pages: 505-511

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Geometric characterizations of Banach spaces using ψ-direct sums2015

    • Author(s)
      Ken-ichi Mitani, Kichi-Suke Saito
    • Journal Title

      Proc. 8th International Conference on Nonlinear Analysis and Convex Analysis

      Volume: --- Pages: 351-359

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Convex property of James and von Neumann-Jordan constant of absolute norms on R^22015

    • Author(s)
      Naoto Komuro, Kichi-Suke Saito, Ken-ichi Mitani
    • Journal Title

      Proc. 8th International Conference on Nonlinear Analysis and Convex Analysis

      Volume: --- Pages: 301-308

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Skewness of absolute normalized norms on R^22015

    • Author(s)
      Ken-ichi Mitani, Kichi-Suke Saito, Naoto Komuro
    • Journal Title

      Proc. 8th International Conference on Nonlinear Analysis and Convex Analysis

      Volume: --- Pages: 361-367

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] On generalized Beckners's inequality2015

    • Author(s)
      Kichi-Suke Saito, Ryotaro Tanaka
    • Journal Title

      Anal. Funct. Anal.

      Volume: 6 Issue: 1 Pages: 267-278

    • DOI

      10.15352/afa/06-1-20

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Duality of the James constant of Banach spaces2015

    • Author(s)
      田中亮太朗、斎藤吉助,佐藤正博
    • Journal Title

      数理研講究禄

      Volume: 1963 Pages: 65-70

    • Related Report
      2015 Research-status Report
  • [Journal Article] Generalized Beckner's inequalities and its applications to new geometrical properties2015

    • Author(s)
      斎藤吉助,田中亮太朗
    • Journal Title

      数理研講究禄

      Volume: 1963 Pages: 108-113

    • Related Report
      2015 Research-status Report
  • [Journal Article] A characterization of extreme norms on R^22015

    • Author(s)
      横山駿平、斎藤吉助,田中亮太朗
    • Journal Title

      数理研講究禄

      Volume: 1935 Pages: 1-5

    • Related Report
      2015 Research-status Report
  • [Journal Article] On the uniform non-l_n ~1 -ness and new classes of convex functions2015

    • Author(s)
      Kato, Mikio, Tamura, Takayuki
    • Journal Title

      J. Nonlinear Convex Anal.

      Volume: 16 Pages: 2279-2295

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] Direct sums of Banach spaces with FPP which fail to be uniformly non-square2015

    • Author(s)
      Kato, Mikio, Tamura, Takayuki
    • Journal Title

      J. Nonlinear Convex Anal.

      Volume: 16 Pages: 231-241

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] Uniform non-squareness for A-direct sums of Banach spaces with a strictly monotone norm2015

    • Author(s)
      Sompong Dhompongsa, Mikio Kato, Takayuki Tamura
    • Journal Title

      Linear and Nonlinear Analysis

      Volume: 1 Pages: 247-260

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Presentation] Symmetric points for Birkhoff orthogonality I2019

    • Author(s)
      田中亮太朗, 小室直人, 斎藤吉助
    • Organizer
      日本数学会年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Symmetric points for Birkhoff orthogonality II2019

    • Author(s)
      田中亮太朗, 小室直人, 斎藤吉助
    • Organizer
      日本数学会年会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 精密化された三角不等式の等号成立条件について2018

    • Author(s)
      大和田智義, 斎藤吉助, 三谷健一、
    • Organizer
      数理解析研究所研究集会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Geometrical constants of Day-James spaces2018

    • Author(s)
      三谷健一, 斎藤吉助,
    • Organizer
      数理解析研究所研究集会
    • Related Report
      2018 Annual Research Report
  • [Presentation] On the symmetry of Birkhoff orthogonality in Banach spaces2018

    • Author(s)
      斎藤吉助、 田中亮太朗、小室直人
    • Organizer
      数理解析研究所研究集会
    • Related Report
      2018 Annual Research Report
  • [Presentation] On the symmetry of Banach soaces2018

    • Author(s)
      Kichi-Suke Saito, Naoto Komuro, Ryotaro Tanaka
    • Organizer
      Nao-Asia 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Which dimensional Banach spaces are complicated two or three more?2018

    • Author(s)
      斎藤吉助
    • Organizer
      京都大学数理解析研究所研究集会
    • Related Report
      2017 Research-status Report
  • [Presentation] Von Neumann-Jordan constant of generalized Banas-Fraczek spaces2018

    • Author(s)
      三谷健一, 斎藤吉助,高橋泰嗣
    • Organizer
      京都大学数理解析研究所研究集会
    • Related Report
      2017 Research-status Report
  • [Presentation] 回転不変ノルムによる幾何学的定数2017

    • Author(s)
      冨澤佑季乃、三谷健一、斎藤吉助,田中亮太朗
    • Organizer
      日本数学会年会
    • Place of Presentation
      首都大学東京(東京都・八王子市)
    • Year and Date
      2017-03-24
    • Related Report
      2016 Research-status Report
  • [Presentation] James定数の行列の表現とその応用2017

    • Author(s)
      斎藤吉助,小室直人、田中亮太朗
    • Organizer
      日本数学会年会
    • Place of Presentation
      首都大学東京(東京都・八王子市)
    • Year and Date
      2017-03-24
    • Related Report
      2016 Research-status Report
  • [Presentation] Some recent results on direct sums of Banach spaces2017

    • Author(s)
      加藤幹雄。田村高幸
    • Organizer
      日本数学会年会
    • Place of Presentation
      首都大学東京(東京都・八王子市)
    • Year and Date
      2017-03-24
    • Related Report
      2016 Research-status Report
  • [Presentation] 最良のJames 定数を持つバナッハ空間の特徴付けとそのLassak 問題への応用2017

    • Author(s)
      田中亮太朗, 小室直人, 斎藤吉助
    • Organizer
      京都大学数理解析研究所研究集会
    • Place of Presentation
      京都大学数理解析研究所(京都府・京都市)
    • Year and Date
      2017-02-06
    • Related Report
      2016 Research-status Report
  • [Presentation] 2次元ローレンツ空間のJames 定数についての最近の発展2017

    • Author(s)
      斎藤吉助, 田中亮太朗, 三谷健一
    • Organizer
      京都大学数理解析研究所研究集会
    • Place of Presentation
      京都大学数理解析研究所(京都府・京都市)
    • Year and Date
      2017-02-06
    • Related Report
      2016 Research-status Report
  • [Presentation] von Neumann-Jordan constant of l_p-l_q spaces2017

    • Author(s)
      三谷健一, 斎藤吉助,
    • Organizer
      京都大学数理解析研究所研究集会
    • Place of Presentation
      京都大学数理解析研究所(京都府・京都市)
    • Year and Date
      2017-02-06
    • Related Report
      2016 Research-status Report
  • [Presentation] Some results on James type constant of a Banach space2017

    • Author(s)
      高橋泰嗣、加藤幹雄、三谷健一
    • Organizer
      京都大学数理解析研究所研究集会
    • Place of Presentation
      京都大学数理解析研究所(京都府・京都市)
    • Year and Date
      2017-02-06
    • Related Report
      2016 Research-status Report
  • [Presentation] Dunkl-Williams 不等式の一般化について2017

    • Author(s)
      田開伯幸、三谷健一、大和田智義
    • Organizer
      京都大学数理解析研究所研究集会
    • Place of Presentation
      京都大学数理解析研究所(京都府・京都市)
    • Year and Date
      2017-02-06
    • Related Report
      2016 Research-status Report
  • [Presentation] On the structure of Banach spaces with James constant √22017

    • Author(s)
      斎藤吉助,  小室直人,  田中亮太朗
    • Organizer
      京都大学数理解析研究所研究集会
    • Related Report
      2017 Research-status Report
  • [Presentation] More on the class of Banach spaces with James constant2017

    • Author(s)
      Kichi-Suke Saito, Naoto Komuro, and Ryotaro Tanaka
    • Organizer
      NonlinearAnalysis and Convex Analysis 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the von Neumann-Jordan constant of generalized Banach-Fraczek spaces II2017

    • Author(s)
      Ken-Ichi Mitani, Kichi-Suke Saito, Yasuji Takahashi
    • Organizer
      NonlinearAnalysis and Convex Analysis 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Direct sums of Banach spaces and convex functions2017

    • Author(s)
      Mikio Kato
    • Organizer
      Mathematical colloquium
    • Place of Presentation
      Poznan University of Technology(Poznan、Poland)
    • Related Report
      2016 Research-status Report
  • [Presentation] バナッハ空間の幾何学的定数と行列ノルムについて2016

    • Author(s)
      斎藤吉助,小室直人、田中亮太朗
    • Organizer
      京都大学数理解析研究所研究集会
    • Place of Presentation
      京都大学数理解析研究所(京都府・京都市)
    • Year and Date
      2016-11-09
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] On direct sums of Banach spaces2016

    • Author(s)
      加藤幹雄、田村高幸
    • Organizer
      実解析学シンポジウム2016
    • Place of Presentation
      奈良女子大学(奈良県・奈良市)
    • Year and Date
      2016-10-21
    • Related Report
      2016 Research-status Report
  • [Presentation] On the von Neumann-Jordan constant of Banas-Fraaczek space2016

    • Author(s)
      三谷健一, 斎藤吉助, 高橋泰嗣
    • Organizer
      日本数学会秋期分科会
    • Place of Presentation
      関西大学(大阪府・吹田市)
    • Year and Date
      2016-09-15
    • Related Report
      2016 Research-status Report
  • [Presentation] Rotation invariant norms on R^2 and geometric constants2016

    • Author(s)
      Kichi-Suke Saito, Naoto Komuro, Ryotaro Tanaka
    • Organizer
      京都大学数理解析研究所研究集会
    • Place of Presentation
      京都大学数理解析研究所(京都府・京都市)
    • Year and Date
      2016-08-31
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] π/2-rotation invariant norms on R^2 and the James constant2016

    • Author(s)
      Kichi-Suke Saito, Naoto Komuro, Ryotaro Tanaka
    • Organizer
      Nao-Asia 2016
    • Place of Presentation
      Toki Messe(新潟県・新潟市)
    • Year and Date
      2016-08-01
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Geometric constants of π/2-rotation invariant norms2016

    • Author(s)
      Yukino Tomizawa, Ken-Ichi Mitani, Kichi-Suke Saito、Ryotaro Tanaka
    • Organizer
      Nao-Asia 2016
    • Place of Presentation
      Toki Messe(新潟県・新潟市)
    • Year and Date
      2016-08-01
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] A characterization of two-dimensional normed spaces with James constant2016

    • Author(s)
      Ryotaro Tanaka, Naoto Komuro, Kichi-Suke Saito
    • Organizer
      Nao-Asia 2016
    • Place of Presentation
      Toki Messe(新潟県・新潟市)
    • Year and Date
      2016-08-01
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] On the von Neumann-Jordan constant of l^p-l^q spaces2016

    • Author(s)
      Ken-Ichi Mitani, Yasuji Takahashi, Kichi-Suke Saito
    • Organizer
      Nao-Asia 2016
    • Place of Presentation
      Toki Messe(新潟県・新潟市)
    • Year and Date
      2016-08-01
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 回転不変ノルムに対するJames 定数の双対性について2016

    • Author(s)
      田中亮太朗、小室直人、斎藤吉助
    • Organizer
      2016年日本数学会年会
    • Place of Presentation
      筑波大学, 茨城県つくば市
    • Year and Date
      2016-03-16
    • Related Report
      2015 Research-status Report
  • [Presentation] 位数の小さいジャイロ群について2015

    • Author(s)
      渡邉恵一
    • Organizer
      関数環研究集会
    • Place of Presentation
      新潟大学駅南キャンパス「ときめいと」、新潟県新潟市
    • Year and Date
      2015-12-19
    • Related Report
      2015 Research-status Report
  • [Presentation] James 定数√2 とノルムの幾何構造との関係について2015

    • Author(s)
      田中亮太郎、 小室直人、斎藤吉助
    • Organizer
      実解析学シンポジウム2015
    • Place of Presentation
      東邦大学習志野キャンパス、千葉県習志野市
    • Year and Date
      2015-10-23
    • Related Report
      2015 Research-status Report
  • [Presentation] バナッハ空間の幾何学的構造についての最近の進展2015

    • Author(s)
      斎藤吉助
    • Organizer
      2015年日本数学会秋期総合分科会
    • Place of Presentation
      京都産業大学、京都府京都市
    • Year and Date
      2015-09-13
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] ノルム空間における幾何学的定数の上限値2015

    • Author(s)
      水口洋康、斎藤吉助
    • Organizer
      2015年日本数学会秋期総合分科会
    • Place of Presentation
      京都産業大学,京都府京都市
    • Year and Date
      2015-09-13
    • Related Report
      2015 Research-status Report
  • [Presentation] Which Banach space has James constant √2 ?2015

    • Author(s)
      Kichi-Suke Saito, Naoto Komuro, Ryotaro Tanaka
    • Organizer
      The Fifth International Symposium on Banach and Function Spaces 2015
    • Place of Presentation
      九州工業大学工学部、福岡県北九州市
    • Year and Date
      2015-09-02
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] On the von Neumann-Jordan constant for Bana´s-Fraczek space2015

    • Author(s)
      Ken-Ichi Mitani, Yasuji Takahashi, Kichi-Suke Saito
    • Organizer
      The Fifth International Symposium on Banach and Function Spaces 2015
    • Place of Presentation
      九州工業大学工学部、福岡県北九州市
    • Year and Date
      2015-09-02
    • Related Report
      2015 Research-status Report
  • [Presentation] The duality equality for James constant of Banach spaces2015

    • Author(s)
      Ryotaro Tanaka, Kichi-Suke Saito
    • Organizer
      The Fifth International Symposium on Banach and Function Spaces 2015
    • Place of Presentation
      九州工業大学工学部、福岡県北九州市
    • Year and Date
      2015-09-02
    • Related Report
      2015 Research-status Report

URL: 

Published: 2015-04-16   Modified: 2020-03-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi