Kohsaka Fumiaki 高阪史明

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KOHSAKA Fumiaki 高阪史明

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Researcher Number	20434003
Other IDs
Affiliation (Current)	2025: 東海大学, 理学部, 教授
Affiliation (based on the past Project Information) *help	2017 – 2023: 東海大学, 理学部, 教授 2015 – 2016: 東海大学, 理学部, 准教授 2013 – 2014: 大分大学, 工学部, 准教授
Review Section/Research Field	Principal Investigator Foundations of mathematics/Applied mathematics Except Principal Investigator Basic Section 12020:Mathematical analysis-related / Foundations of mathematics/Applied mathematics
Keywords	Principal Investigator 凸解析 / 不動点 / CAT(1)空間 / 近接点法 / アダマール空間 / 不動点近似 / 不動点定理 / Bregman distance / 測地的距離空間 / バナッハ空間 … More / ヒルベルト空間 / 凸関数 / 不動点理論 / 非線形問題 / 非線形解析学 / 非線形解析 / 制約可能性問題 / 共通不動点 / 最小点近似 / レゾルベント / ヒルベルト球面 / CAT(0)空間 / 最小点 / 完備CAT(0)空間 / Bregman距離 / 強非拡大写像 / 非拡大写像 / 測地距離空間 / 凸解析学 / 集合値写像 / 非線形作用素 / 関数解析 / 球面幾何 / 完備CAT(1)空間 / 単調作用素 … More Except Principal Investigator 凸解析 / 測地距離空間 / ベクトル場 / リゾルベント作用素 / 均衡問題 / 凸最小化問題 / 非線形解析 / 解析学 / リゾルベント / 不動点理論 / 凸解析学 Less

Study of vector fields and development of convex analysis on complete geodesic spaces
- Principal Investigator
  
  木村泰紀
- Project Period (FY)
  2021 – 2025
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 12020:Mathematical analysis-related
- Research Institution
  Toho University
A study on fixed point problems in metric spaces with geodesic structure and its applicationsPrincipal Investigator
- Principal Investigator
  
  Kohsaka Fumiaki
- Project Period (FY)
  2017 – 2020
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Foundations of mathematics/Applied mathematics
- Research Institution
  Tokai University
Convex analysis on complete geodesic spaces using the techniques of fixed point theory
- Principal Investigator
  
  KIMURA Yasunori
- Project Period (FY)
  2015 – 2018
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Foundations of mathematics/Applied mathematics
- Research Institution
  Toho University
A study on nonlinear problems using convex analysis and fixed point theoryPrincipal Investigator
- Principal Investigator
  
  KOHSAKA Fumiaki
- Project Period (FY)
  2013 – 2016
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Foundations of mathematics/Applied mathematics
- Research Institution
  Tokai University
  Oita University

All 2021 2020 2019 2018 2017 2016 2015 2014 2013 Other

All Journal Article Presentation

[Journal Article] Strongly quasinonexpansive mappings, III2020
- Author(s)
  Koji Aoyama and Fumiaki Kohsaka
- Journal Title
  
  Linear and Nonlinear Analysis
  
  Volume: 6, No.1
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17K05372
[Journal Article] Fixed points of metrically nonspreading mappings in Hadamard spaces2019
- Author(s)
  Fumiaki Kohsaka
- Journal Title
  
  Applied Analysis and Optimization
  
  Volume: 3-2
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17K05372
[Journal Article] Two modified proximal point algorithms in geodesic spaces with curvature bounded above2019
- Author(s)
  Yasunori Kimura and Fumiaki Kohsaka
- Journal Title
  
  Rendiconti del Circolo Matematico di Palermo Series 2
  
  Volume: 68-1 Issue: 1 Pages: 83-104
- DOI
  10.1007/s12215-018-0340-3
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17K05372, KAKENHI-PROJECT-15K05007
[Journal Article] Existence and approximation of fixed points of vicinal mappings in geodesic spaces2018
- Author(s)
  Fumiaki Kohsaka
- Journal Title
  
  Pure and Applied Functional Analysis
  
  Volume: 3 Pages: 91-106
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-15K05007
[Journal Article] Existence and approximation of fixed points of vicinal mappings in geodesic spaces2018
- Author(s)
  Fumiaki Kohsaka
- Journal Title
  
  Pure and Applied Functional Analysis
  
  Volume: 3-1
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17K05372
[Journal Article] ヒルベルト空間における二つの可換なhybrid写像の共通不動点2018
- Author(s)
  高阪史明
- Journal Title
  
  京都大学数理解析研究所講究録
  
  Volume: 2065
- Data Source
  KAKENHI-PROJECT-17K05372
[Journal Article] Cutter mappings and subgradient projections in Banach spaces2017
- Author(s)
  Koji Aoyama and Fumiaki Kohsaka
- Journal Title
  
  Linear and Nonlinear Analysis
  
  Volume: 3-3
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17K05372
[Journal Article] The proximal point algorithm in geodesic spaces with curvature bounded above2017
- Author(s)
  Yasunori Kimura and Fumiaki Kohsaka
- Journal Title
  
  Linear and Nonlinear Analysis
  
  Volume: 3-1
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17K05372
[Journal Article] Existence and approximation of fixed points of Chatterjea mappings with Bregman distances2017
- Author(s)
  Fumiaki Kohsaka and Tomonari Suzuki
- Journal Title
  
  Linear and Nonlinear Analysis
  
  Volume: 3
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] The proximal point algorithm in geodesic spaces with curvature bounded above2017
- Author(s)
  Yasunori Kimura and Fumiaki Kohsaka
- Journal Title
  
  Linear and Nonlinear Analysis
  
  Volume: 3
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] Existence and approximation of fixed points of Chatterjea mappings with Bregman distances2017
- Author(s)
  Fumiaki Kohsaka and Tomonari Suzuki
- Journal Title
  
  Linear and Nonlinear Analysis
  
  Volume: 3-1
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17K05372
[Journal Article] Spherically nonspreading mappings in geodesic spaces with curvature bounded above by one2016
- Author(s)
  Y. Kimura and F. Kohsaka
- Journal Title
  
  Journal of Fixed Point Theory and Applications
  
  Volume: 18 Issue: 1 Pages: 93-115
- DOI
  10.1007/s11784-015-0267-7
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-15K05007, KAKENHI-PROJECT-25800094
[Journal Article] Two modified proximal point algorithms for convex functions in Hadamard spaces2016
- Author(s)
  Y. Kimura and F. Kohsaka
- Journal Title
  
  Linear and Nonlinear Analysis
  
  Volume: 2 Pages: 69-86
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-15K05007
[Journal Article] Two modified proximal point algorithms for convex functions in Hadamard spaces2016
- Author(s)
  Yasunori Kimura and Fumiaki Kohsaka
- Journal Title
  
  Linear and Nonlinear Analysis
  
  Volume: 2
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] Existence and approximation of common fixed points of two hybrid mappings in Hilbert spaces2015
- Author(s)
  Fumiaki Kohsaka
- Journal Title
  
  Journal of Nonlinear and Convex Analysis
  
  Volume: 16 Pages: 2193-2205
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] バナッハ空間におけるfirmly nonexpansive-like写像に対する不動点近似2015
- Author(s)
  高阪史明
- Journal Title
  
  京都大学数理解析研究所講究録
  
  Volume: 1963 Pages: 170-177
- Open Access
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] Ray's theorem revisited: a fixed point free firmly nonexpansive mapping in Hilbert spaces2015
- Author(s)
  Fumiaki Kohsaka
- Journal Title
  
  Journal of Inequalities and Applications
  
  Volume: 2015 Issue: 1 Pages: 1-3
- DOI
  10.1186/s13660-015-0606-7
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] Weak convergence theorem for a sequence of quasinonexpansive type mappings2015
- Author(s)
  Fumiaki Kohsaka
- Journal Title
  
  Proceedings of the 8th International Conference on Nonlinear Analysis and Convex Analysis
  
  Volume: - Pages: 289-300
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] An implicitly defined iterative sequence for monotone operators in Banach spaces2014
- Author(s)
  Fumiaki Kohsaka
- Journal Title
  
  Journal of Inequalities and Applications
  
  Volume: 2014 Issue: 1 Pages: 1-9
- DOI
  10.1186/1029-242x-2014-181
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] Averaged sequences for nonspreading mappings in Banach spaces2014
- Author(s)
  Fumiaki Kohsaka
- Journal Title
  
  Proceedings of the International Symposium on Banach and Function Spaces IV
  
  Volume: - Pages: 313-323
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] Viscosity ap- proximation process for a sequence of quasi- nonexpansive mappings2014
- Author(s)
  K. Aoyama and F. Kohsaka
- Journal Title
  
  Fixed Point Theory and Applications
  
  Volume: 17 Issue: 1 Pages: 11-11
- DOI
  10.1186/1687-1812-2014-17
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21540113, KAKENHI-PROJECT-25800094
[Journal Article] Strongly relatively nonexpansive sequences generated by firmly nonexpansive-like mappings2014
- Author(s)
  Koji Aoyama, Fumiaki Kohsaka
- Journal Title
  
  Fixed Point Theory and Applications
  
  Volume: 2014 Issue: 1 Pages: 1-13
- DOI
  10.1186/1687-1812-2014-95
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] ハイブリッド写像の不動点について2013
- Author(s)
  高阪史明
- Journal Title
  
  京都大学数理解析研究所講究録
  
  Volume: 1841 Pages: 77-85
- Data Source
  KAKENHI-PROJECT-25800094
[Journal Article] 集合値写像の零点問題と関連する不動点定理2013
- Author(s)
  高阪史明
- Journal Title
  
  京都大学数理解析研究所講究録
  
  Volume: 1852 Pages: 25-32
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] アダマール空間における凸関数の最小点近似2021
- Author(s)
  高阪史明
- Organizer
  京都大学数理解析研究所研究集会非線形解析学と凸解析学の研究
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Firmly nonexpansive like mappings in Banach spaces2019
- Author(s)
  Fumiaki Kohsaka
- Organizer
  Workshop on "Convex Analysis on Geodesic Spaces", Khon Kaen University, Khon Kaen, Thailand, September 17--18, 2019
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Finding fixed points of metrically nonspreading mappings in Hadamard spaces2019
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The 2nd International Workshop on Applied Nonlinear Analysis (IWANA2019), Bangsaen, Chonburi, Thailand, September 12--14, 2019
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fixed points of metrically nonspreading mappings in Hadamard spaces2019
- Author(s)
  Fumiaki Kohsaka
- Organizer
  International Conference on Nonlinear Analysis and Convex Analysis--International Conference on Optimization: Techniques and Applications (NACA-ICOTA2019), August 26--31, 2019
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fixed point problems for firmly nonexpansive like mappings in Banach spaces2019
- Author(s)
  Fumiaki Kohsaka
- Organizer
  14th International Seminar on Optimization and Related Areas (ISORA), the Instituto de Matematica y Ciencias Afines (IMCA), Lima, Peru, October 7--11, 2019
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Metrically nonspreading mappings2019
- Author(s)
  Fumiaki Kohsaka
- Organizer
  Workshop on "Convex Analysis on Geodesic Spaces", Khon Kaen University, Khon Kaen, Thailand, September 17--18, 2019
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] On metric completeness and some preservations of convex metric spaces in the sense of Takahashi2019
- Author(s)
  Pinya Ardsalee, Fumiaki Kohsaka, Jenjira Puiwong, and Satit Saejung
- Organizer
  International Conference on Nonlinear Analysis and Convex Analysis--International Conference on Optimization: Techniques and Applications (NACA-ICOTA2019), August 26--31, 2019
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fixed points of vicinal mappings in complete CAT(1) spaces2018
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The 10th Asian Conference on Fixed Point Theory and Optimization, The Empress Hotel, Chiang Mai, Thailand, July 16--18, 2018
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fundamental properties of resolvents of convex functions in geodesic spaces2018
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Seminar on Fixed Point Theory and Optimization, Khon Kaen University, Khon Kaen, Thailand, September 12, 2018
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fixed points of Chatterjea mappings with Bregman distances in Banach spaces2018
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The 6th Asian Conference on Nonlinear Analysis and Optimization, ANA Intercontinental Manza Beach Resort, Onna-son, Okinawa, Japan, November 5--9, 2018
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Recent results on the resolvents of convex functions in geodesic spaces2018
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Inthernational Symposium on Nonlinear Convex Analysis and Optimization 2018, King Mongkut's University of Technology Thonburi, Bangkok, Thailand, July 19--22, 2018
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fixed points of nonspreading mappings and its relatives in Banach spaces2018
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Seminar on Fixed Point Theory and Optimization, Khon Kaen University, Khon Kaen, Thailand, September 12, 2018
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] 完備CAT(1)空間における凸関数の最小点近似2018
- Author(s)
  高阪史明
- Organizer
  日本数学会2019年度年会, 東京工業大学理学院数学系, 2019年3月17日--20日
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fixed points of vicinal mappings and convex optimization in geodesic metric spaces2018
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Inthernational Workshop on Variational Analysis and Applications, Ettore Majorana Foundation and Centre for Scientific Culture, Erice--Sicily, Italy, August 28--September 5, 2018
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] The proximal point algorithm for convex functions in geodesic spaces2018
- Author(s)
  Fumiaki Kohsaka
- Organizer
  A seminar on Nonlinear Analysis and Applications, Tokai University, Hiratsuka, Japan, April 4, 2018
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] 上に有界な曲率を持つ完備測地的距離空間におけるspherically nonspreading写像の不動点2017
- Author(s)
  高阪史明
- Organizer
  2017年度秋季総合分科会, 山形大学小石川キャンパス, 2017年9月11日--14日
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] The proximal point algorithm and its variants for convex functions in geodesic metric spaces2017
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The 10th Anniversary International Conference on Nonlinear Analysis and Convex Analysis, Chitose City Cultural Center, Chitose, Japan, July 4--9, 2017
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] 完備CAT(1)空間における凸関数に対する近接点法2017
- Author(s)
  高阪史明
- Organizer
  日本数学会2018年度年会, 東京大学大学院数理科学研究科, 2018年3月18日--21日
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] The proximal point algorithm and its variants for convex functions in geodesic metric spaces2017
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The 10th Anniversary International Conference on Nonlinear Analysis and Convex Analysis
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15K05007
[Presentation] The resolvents of convex functions in geodesic metric spaces2017
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Workshop Convex Analysis in CAT(k) Spaces, King Mongkut's University of Technology Thonburi, Bangkok, Thailand, September 8--9, 2017
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] The resolvents of convex functions in geodesic metric spaces2017
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Workshop Convex Analysis in CAT(k) Spaces
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15K05007
[Presentation] Approximating minimizers of convex functions in geodesic metric spaces with curvature bounded above2017
- Author(s)
  Fumiaki Kohsaka
- Organizer
  XII International Symposium on Generalized Convexity and Monotonicity
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15K05007
[Presentation] Approximating minimizers of convex functions in geodesic metric spaces with curvature bounded above2017
- Author(s)
  Fumiaki Kohsaka
- Organizer
  XII International Symposium on Generalized Convexity and Monotonicity, Hajduszoboszlo, Hungary, August 27--September 2, 2017
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fixed point problems for spherically nonspreading mappings and vicinal mappings in CAT(1) spaces2017
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Workshop Convex Analysis in CAT(k) Spaces, King Mongkut's University of Technology Thonburi, Bangkok, Thailand, September 8--9, 2017
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17K05372
[Presentation] Fixed point problems for spherically nonspreading mappings and vicinal mappings in CAT(1) spaces2017
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Workshop Convex Analysis in CAT(k) Spaces
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15K05007
[Presentation] Minimizing convex functions in geodesic metric spaces with curvature bounded above2016
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The International Conference on New Trends in Optimization and Variational Analysis for Applications
- Place of Presentation
  Quy Nhon University, Quy Nhon, Vietnam
- Year and Date
  2016-12-08
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Existence and approximation of minimizers of convex functions in geodesic metric spaces2016
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The 9th Asian Conference on Fixed Point Theory and Optimization
- Place of Presentation
  King Mongkut's University of Technology Thonburi, Bangkok, Thailand
- Year and Date
  2016-05-19
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Existence and approximation of minimizers of convex functions in geodesic metric spaces2016
- Author(s)
  F. Kohsaka
- Organizer
  The 9th Asian Conference on Fixed Point Theory and Optimizations (ACFPTO2016)
- Place of Presentation
  King Mongkut's University of Technology Thonburi, Bangkok, Thailand
- Year and Date
  2016-05-19
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15K05007
[Presentation] Minimizing convex functions in geodesic metric spaces with curvature bounded above2016
- Author(s)
  F. Kohsaka
- Organizer
  The International Conference on New Trends in Optimization and Variational Analysis for Applications
- Place of Presentation
  Quy Nhon University, Quy Nhon, Vietnam
- Year and Date
  2016-12-08
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15K05007
[Presentation] バナッハ空間における極大単調作用素に対する陰的な零点近似列の強収束性2016
- Author(s)
  高阪史明
- Organizer
  日本数学会2016年度年会
- Place of Presentation
  筑波大学筑波キャンパス (茨城県つくば市)
- Year and Date
  2016-03-18
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] 凸最小化問題と関連する非線形写像とその不動点について2016
- Author(s)
  高阪史明
- Organizer
  数理経済学会2016年度定例セミナー
- Place of Presentation
  法政大学市ヶ谷キャンパス (東京都)
- Year and Date
  2016-06-10
- Invited
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Spherically nonspreading mappings in geodesic metric spaces with curvature bounded above2016
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The 5th Asian Conference on Nonlinear Analysis and Optimization
- Place of Presentation
  Toki Messe, Niigata, Japan
- Year and Date
  2016-08-05
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] アダマール空間における凸関数の最小点近似2016
- Author(s)
  高阪史明
- Organizer
  日本数学会2016年度秋季総合分科会
- Place of Presentation
  関西大学千里山キャンパス (大阪府)
- Year and Date
  2016-09-17
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Common fixed points of two commutative hybrid mappings in Hilbert spaces2016
- Author(s)
  高阪史明
- Organizer
  非線形解析学と凸解析学の研究
- Place of Presentation
  京都大学数理解析研究所 (京都府)
- Year and Date
  2016-09-01
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Spherically nonspreading mappings in geodesic metric spaces with curvature bounded above2016
- Author(s)
  F. Kohsaka
- Organizer
  The 5th Asian Conference on Nonlinear Analysis and Optimization (NAO-Asia2016)
- Place of Presentation
  朱鷺メッセ（新潟県新潟市）
- Year and Date
  2016-08-05
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-15K05007
[Presentation] Mean convergence theorems for pointwise convergent sequences of hybrid mappings2015
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Ninth International Conference on Nonlinear Analysis and Convex Analysis
- Place of Presentation
  Rimkok Resort Hotel, Chiang Rai, Thailand
- Year and Date
  2015-01-21
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Asymptotic behavior of averaged sequences for nonspreading mappings in Banach spaces2015
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Fifth International Symposium on Banach and Function Spaces 2015
- Place of Presentation
  Kyushu Institute of Technology, Kitakyushu, Japan
- Year and Date
  2015-09-02
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] An implicitly defined iterative sequence for maximal monotone operators in Banach spaces2015
- Author(s)
  Fumiaki Kohsaka
- Organizer
  VII Symposium on Nonlinear Analysis
- Place of Presentation
  Nicolaus Copernicus University, Torun, Poland
- Year and Date
  2015-09-17
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Finding fixed points of firmly nonexpansive-like mappings in Banach spaces2014
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The International Congress in Honour of Professor Ravi P. Agarwal
- Place of Presentation
  Uludag University, Bursa, Turkey
- Year and Date
  2014-06-24
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Fixed point approximation for firmly nonexpansive-like mappings in Banach spaces2014
- Author(s)
  高阪史明
- Organizer
  非線形解析学と凸解析学の研究
- Place of Presentation
  京都大学数理解析研究所 (京都府京都市)
- Year and Date
  2014-08-21
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Strong convergence theorem for a strongly relatively nonexpansive sequence of mappings
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The International Conference on Nonlinear Analysis and Optimization
- Place of Presentation
  National Sun Yat-sen University, Kaohsiung, Taiwan
- Invited
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] 二変数関数の鞍点と非線形写像の不動点
- Author(s)
  高阪史明
- Organizer
  日本数学会2013年度秋季総合分科会
- Place of Presentation
  愛媛大学城北キャンパス
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] Unbounded sets and nonexistence of fixed points in Banach spaces
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The International Conference Anatolian Communications in Nonlinear Analysis
- Place of Presentation
  Abant Izzet Baysal University, Bolu, Turkey
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] On firmly nonexpansive type mappings in Banach spaces
- Author(s)
  Fumiaki Kohsaka
- Organizer
  The Eighth International Conference on Nonlinear Analysis and Convex Analysis
- Place of Presentation
  Hirosaki University, Hirosaki, Japan
- Data Source
  KAKENHI-PROJECT-25800094
[Presentation] ヒルベルト空間におけるハイブリッド写像に対する不動点問題
- Author(s)
  高阪史明
- Organizer
  Miniworkshop on Analysis at Kagurazaka
- Place of Presentation
  東京理科大学神楽坂キャンパス
- Data Source
  KAKENHI-PROJECT-25800094

1. KIMURA Yasunori (20313447)

# of Collaborated Projects: 2 results

# of Collaborated Products: 2 results
2. 佐藤健治 (70307164)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
3. 青山耕治

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Kohsaka Fumiaki 高阪 史明

KOHSAKA Fumiaki 高阪 史明

Research Projects

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Study of vector fields and development of convex analysis on complete geodesic spaces

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A study on fixed point problems in metric spaces with geodesic structure and its applicationsPrincipal Investigator

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Convex analysis on complete geodesic spaces using the techniques of fixed point theory

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A study on nonlinear problems using convex analysis and fixed point theoryPrincipal Investigator

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[Journal Article] Strongly quasinonexpansive mappings, III2020

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[Journal Article] Fixed points of metrically nonspreading mappings in Hadamard spaces2019

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[Journal Article] Two modified proximal point algorithms in geodesic spaces with curvature bounded above2019

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[Journal Article] Existence and approximation of fixed points of vicinal mappings in geodesic spaces2018

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[Journal Article] Existence and approximation of fixed points of vicinal mappings in geodesic spaces2018

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[Journal Article] ヒルベルト空間における二つの可換なhybrid写像の共通不動点2018

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[Journal Article] Cutter mappings and subgradient projections in Banach spaces2017

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[Journal Article] The proximal point algorithm in geodesic spaces with curvature bounded above2017

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[Journal Article] Existence and approximation of fixed points of Chatterjea mappings with Bregman distances2017

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[Journal Article] The proximal point algorithm in geodesic spaces with curvature bounded above2017

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[Journal Article] Existence and approximation of fixed points of Chatterjea mappings with Bregman distances2017

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[Journal Article] Spherically nonspreading mappings in geodesic spaces with curvature bounded above by one2016

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[Journal Article] Two modified proximal point algorithms for convex functions in Hadamard spaces2016

Kohsaka Fumiaki 高阪史明

KOHSAKA Fumiaki 高阪史明