Watanabe Keiichi

ワタナベケイイチ | Watanabe Keiichi

Affiliation and department：
Job title： Associate Professor

Research field (1)： Basic analysis

Research keywords (6)： gyrovector space , gyrovector spaces , 作用素論 , 関数解析 , operator theory , functional analysis

Research theme for competitive and other funds (25)：

2021 - 2026 ジャイロベクトル空間の関数解析的研究
2015 - 2019 A study of geometric structure of Banach spaces and its applications
2011 - 2016 Research on Jordan type model theory of weighted composition operators on Hilbert spaces
2011 - 2013 Various constants and norm inequalities in Banach spaces and its applications
2010 - 2012 Study on preserver problems on Banach alebras

2008 - 2010 The study of norm structure and various constants of Banach spaces, and its applications

2007 - 2009 Study on algebraic properties of maps between Banach algebras which preserve topological quantities

2006 - 2007 The form of unit balls and the constants of Banach spaces and their applications

2005 - 2006 Research on algebraic equations with coefficients in Banach algebras

2004 - 2005 Several constants of Banach spaces and its application

2002 - 2003 Research on automatic linearities for ring homomorphisms on commutative Banach algebras

2001 - 2002 正則関数空間上の合成作用素のJordan型モデル理論に関する研究

2000 - 2001 Von Neumann-Jordan constant of Banach spaces and its application

1999 - 2000 非可換L^p空間上の等距離作用素の構造の研究

1999 - 2000 Research on operating functions on function spaces

1997 - 1998 Research on operators with natural spectrum

1997 - 1998 The structure of Hilbert modules over operator algebras and its application

1996 - 1996 多変数Hardy空間上のToeplitz型作用素と不変部分空間の相互関係

1996 - 1996 作用素環の手法による作用素と不変部分空間の研究

1995 - 1995 非可換積分論と非可換次元論の研究

1994 - 1994 非可換積分論と非可換次元論の研究

1992 - 1992 非可換積分論と対称ノルム両側加群の研究

1989 - 1989 微分可能多様体上の幾何学

Hilbert 空間上の有界線型作用素の構造理論

structure theory of bounded linear operators on Hilbert spaces

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Papers (36)：

Keiichi Watanabe. M\"obius gyrovector spaces and functional analysis. RIMS K\^oky\^uroku Bessatsu. 2023. B93. 223-237
Keiichi Watanabe. On a notion of complex Möbius gyrovector spaces. Nihonkai Math. J. 2021. 32. 2. 111-131
Keiichi Watanabe. On Lipschitz continuity with respect to the Poincaré metric of linear contractions between Möbius gyrovector spaces. Journal of Inequalities and Applications. 2021. 2021. 1
Keiichi Watanabe. On Quasi Gyrolinear Maps between Möbius Gyrovector Spaces Induced from Finite Matrices. Symmetry. 2021. 13. 1. 76-76
Keiichi Watanabe. Continuous Quasi Gyrolinear Functionals on Möbius Gyrovector Spaces. Journal of Function Spaces. 2020. 2020. 1-14

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Education (4)：

Professional career (1)：

Committee career (2)：

Association Membership(s) (2)：

日本数学会 , Mathematical Society of Japan

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