Takuya HOSOKAWAAssociate Professor
■Researcher basic information
Organization
Research Keyword
Educational Background
- 01 Apr. 2000 - 31 Mar. 2003, Niigata University, Graduate School of Science and Technology, 情報理工学専攻
- Apr. 2000 - Mar. 2003, Niigata University, Graduate School of Science and Technology, 情報理工学専攻
- 01 Apr. 1998 - 31 Mar. 2000, Kyoto University, Graduate School, Division of Natural Science, 数学・数理解析専攻
- Apr. 1998 - Mar. 2000, Kyoto University, Graduate School, Division of Natural Science, 数学・数理解析専攻
- Apr. 1994 - Mar. 1998, Kyoto University, Faculty of Science, 理学科
Career
Member History
■Research activity information
Paper
- Integral-type operators between the weighted Lipschitz spaces on a tree
Toshikazu Abe; Takuya Hosokawa
Nihonkai Mathematical Journal, Jul. 2021, [Reviewed] - Weighted composition operators acting from the Lipschitz space to the space of bounded functions on a tree
We study the weighted composition operators between the Lipschitz space and the space of bounded functions on the set of vertices of an infinite tree. ,We characterize the boundedness, the compactness, and the boundedness from below of weighted composition operators. We also determine the isometric weighted composition operators.
Acta Scientiarum Mathematicarum (Szeged), Apr. 2020, [Reviewed] - Weighted composition operators between Hilbert spaces of analytic functions in the operator norm and Hilbert-Schmidt norm topologies
Takuya Hosokawa; Kei Ji Izuchi; Shuichi Ohno
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, Jan. 2015, [Reviewed] - Some remarks on operator equation $C_\varphi = C_\psi X$
Takuya Hosokawa; Michio Seto
Nihonkai Mathematical Journal, 2014, [Reviewed] - DIFFERENCES OF WEIGHTED COMPOSITION OPERATORS FROM H-infinity TO BLOCH SPACE
Takuya Hosokawa; Shuichi Ohno
TAIWANESE JOURNAL OF MATHEMATICS, Dec. 2012, [Reviewed] - Hilbert-Schmidt differences of composition operators on the Bergman space
Boo Rim Choe; Takuya Hosokawa; Hyungwoon Koo
MATHEMATISCHE ZEITSCHRIFT, Dec. 2011, [Reviewed] - DIFFERENCES OF WEIGHTED COMPOSITION OPERATORS ACTING FROM BLOCH SPACE TO H-infinity
Takuya Hosokawa; Shuichi Ohno
TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY, Oct. 2011, [Reviewed] - Linear Combinations of Composition Operators on the Bloch Spaces
Takuya Hosokawa; Pekka J. Nieminen; Shuichi Ohno
CANADIAN JOURNAL OF MATHEMATICS-JOURNAL CANADIEN DE MATHEMATIQUES, Aug. 2011, [Reviewed] - Differences of weighted composition operators acting from Bloch space to $H^\infty$
Takuya Hosokawa; Sh\^{u}ichi Ohno
Transactions of the American Mathematical Society, 2011, [Reviewed] - Eigenvalues of Weighted Composition Operators on the Bloch Space
Takuya Hosokawa; Quang Dieu Nguyen
INTEGRAL EQUATIONS AND OPERATOR THEORY, Apr. 2010, [Reviewed] - Differences of Weighted Composition Operators on the Bloch Spaces
Takuya Hosokawa
COMPLEX ANALYSIS AND OPERATOR THEORY, Dec. 2009, [Reviewed] - THE ESSENTIAL NORM OF A WEIGHTED COMPOSITION OPERATOR FROM THE BLOCH SPACE TO H-infinity
Takuya Hosokawa
BULLETIN OF THE AUSTRALIAN MATHEMATICAL SOCIETY, Jun. 2009, [Reviewed] - Weighted composition operators on the logarithmic Bloch spaces,with iterated weights
Takuya Hosokawa; Nguyen Quang Dieu, Niigata University
Nihonkai Mathematical Journal, 2009, [Reviewed] - Extreme points of the closed convex hull of composition operators
Takuya Hosokawa
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, Nov. 2008 - Differences of composition operators on the Bloch spaces
Takuya Hosokawa; Sh\^{u}ichi Ohno
Journal of Operator Theory, Apr. 2007, [Reviewed] - Topological structures of the sets of composition operators on the Bloch spaces
T Hosokawa; S Ohno
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, Feb. 2006, [Reviewed] - Minimum moduli of weighted composition operators on algebras of analytic functions
Takuya Hosokawa
Kodai Mathematical Journal, 2006, [Reviewed] - Topological structure of the space of weighted composition operators on H-infinity
T Hosokawa; K Izuchi; S Ohno
INTEGRAL EQUATIONS AND OPERATOR THEORY, Dec. 2005, [Reviewed] - Essential norms of differences of composition operators on H-infinity
T Hosokawa; K Izuchi
JOURNAL OF THE MATHEMATICAL SOCIETY OF JAPAN, Jul. 2005, [Reviewed] - Chaotic behavior of composition operators on the Hardy space
Takuya Hosokawa
Acta Scientiarum Mathematicarum(Szeged), 2003, [Reviewed] - Isolated points and essential components of composition operators on H infinity
T Hosokawa; K Izuchi; D Zheng
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, 2002, [Reviewed]
Lectures, oral presentations, etc.
- Some operators on power growth spaces on a tree
2021年度関数環研究集会, 17 Dec. 2021 - tree上の関数空間とその上の荷重合成作用素
細川卓也
2020年度関数環研究集会, 27 Nov. 2020 - Weighted composition operators between Bergman spaces
細川卓也
Real, Complex and Functional Analysis Seminar 2019, 09 Nov. 2019 - Composition operators induced by products of analytic self-maps
細川卓也
Spring Central and Western Joint Sectional Meeting of American Mathematical Society, 23 Mar. 2019, [Invited] - Integral operators acting from Bergman spaces to BMOA-type spaces
細川卓也
2018年度関数環研究集会, 30 Nov. 2018 - On some operators on function spaces on trees
細川卓也
Real, Complex and Functional Analysis Seminar 2018, 18 Nov. 2018 - 写像の葉数と作用素の挙動について
細川卓也
防大関数解析セミナー, 22 Jun. 2018 - Composition operators with product symbols
細川卓也
Real, Complex and Functional Analysis Seminar 2017, 16 Dec. 2017 - Composition operators with product symbols
細川卓也
第39回東北複素解析セミナー, 29 Nov. 2017 - 解析関数空間上の合成作用素の成す集合の位相構造について
細川卓也
関東作用素論セミナー, 20 May 2017 - 単位円板上の正則自己写像の積と合成作用素の性質について
細川卓也
つくばセミナー, 08 Mar. 2016 - Composition operators with product symbols
細川卓也
2015年度 関数環研究集会, 19 Dec. 2015 - Weighted composition operators between Hilbert spaces of analytic functions in Hilbert-Schmidt norm topologies
細川卓也
日本数学会２０１５年度秋季総合分科会, 15 Sep. 2015 - Linear combinations of composition operators on H^∞ and the Bloch space
２０１３年作用素論・作用素環論研究集会, 24 Nov. 2013, [Invited] - Differences of weighted composition operators from H∞ to the Bloch space
2013日本数学会秋季総合分科会, 25 Sep. 2013 - Some notes on composition operators on the Bloch space
第21回宮代セミナー, 31 Oct. 2012 - Differences of weighted composition operators from the Bloch space to H∞
2012 日本数学会 秋季総合分科会, 20 Sep. 2012 - Differences of weighted composition operators between H∞ and the Bloch spaces
Functional Analysis Seminar, 28 Aug. 2012 - Eigenvalues of weighted composition operators on the Bloch space
日本数学会2012年会, 27 Mar. 2012 - Linear combinations of composition operators on the Bloch space
日本数学会2012年会, 27 Mar. 2012 - Integral type operators from H∞
2011年度関数環研究集会, 02 Dec. 2011 - Composition operators from H∞ to the little Bloch space
第20回宮代セミナー, 18 Aug. 2011 - Differences of composition operators between H∞ and the Bloch space
2010年度関数環研究集会, 30 Nov. 2010 - Extreme points of the closed convex hull of composition operators on H∞
2010 日本数学会 秋季総合分科会, 25 Sep. 2010 - Norms and essential norms of weighted composition operators between the Bloch space and H∞
2010 日本数学会 秋季総合分科会, 25 Sep. 2010 - Linear combinations of composition operators on H∞ and the Bloch spaces
2009年度関数環研究集会, 27 Nov. 2009 - Differences of weighted composition operators between H∞ and the Bloch space
第52回函数論シンポジウム, 21 Nov. 2009 - Differences of weighted composition operators on the Bloch space
2009 日本数学会 秋季総合分科会, 26 Sep. 2009
Research Themes
- Functional analysis approach to time evolution of graphs and its application
Grant-in-Aid for Scientific Research (C)
防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群)
01 Apr. 2020 - 31 Mar. 2024 - Hardy空間とBergman空間の間の荷重合成作用素の研究
基盤研究(C)
Apr. 2021 - Mar. 2024 - Study of graph homomorphisms from functional analysis
Grant-in-Aid for Scientific Research (C)
防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群)
01 Apr. 2015 - 31 Mar. 2019 - 解析関数の乗法演算と合成演算の代数構造と位相構造の研究
基盤研究(C)
Apr. 2016 - Mar. 2019 - Researches on the structures of analytic function spaces and linear operators on them
Grant-in-Aid for Scientific Research (C)
Nippon Institute of Technology
01 Apr. 2015 - 31 Mar. 2018 - 解析関数への乗法演算と合成演算の位相構造の研究
若手研究(B)
Apr. 2013 - Mar. 2016 - Researches on the structures of the spaces of analytic and harmonic functions and operators on them
Grant-in-Aid for Scientific Research (C)
Nippon Institute of Technology
01 Apr. 2012 - 31 Mar. 2015 - Study on the well-posedness of hyperbolic equation with memory
Grant-in-Aid for Scientific Research (C)
Ibaraki University
01 Apr. 2012 - 31 Mar. 2015 - Functional analytic research of hyperbolic equations with memory
Grant-in-Aid for Scientific Research (C)
Ibaraki University
2008 - 2011
