纪友清｜吉林大学｜学者主页

2025

Banach空间上拟幂零算子的幂集

胡朝龙，梁定浩，纪友清

《吉林大学学报(理学版)》

DOI

2025

Power-regularity of weighted shift operators

Chengbin Hu, Youqing Ji

Advances in Operator Theory

DOI

2024

Power set of some quasinilpotent weighted shifts on ℓ

ChaoLong Hu, You Qing Ji, YouQing Ji

Linear Algebra and its Applications

DOI

2024

Maximal numerical ranges of certain classes of operators and approximation

Rui Dou, You Qing Ji, Sen Zhu

Banach Journal of Mathematical Analysis

DOI

2023

On the Power Set of Quasinilpotent Operators

Youqing Ji, Yuanhang Zhang

Integral Equations and Operator Theory

DOI

2021

Power Set of Some Quasinilpotent Weighted Shifts

You Qing Ji, Li Liu

Integral Equations and Operator Theory

DOI

2020

套代数的可逆元群连通性及相关问题

纪友清，张远航

《中国科学:数学》

2019

Connecting invertible analytic Toeplitz operators in G(T(P⊥))

You Qing Ji, Li Liu, Yuanhang Zhang

Journal of Functional Analysis

DOI

2018

应用泛函分析

纪友清

《科学出版社》

2018

On linear maps preserving complex symmetry

You Qing Ji, Ting Liu, Sen Zhu

Journal of Mathematical Analysis and Applications

DOI

2017

On operators with closed numerical ranges

You Qing Ji, Bin Liang

Annals of Functional Analysis

DOI

2017

Operators with closed numerical ranges in nest algebras

Youqing Ji, Bin Liang

Proceedings of the American Mathematical Society

DOI

2015

复变函数

纪友清

《科学出版社》

2015

On the Topological Stable Rank of a Noncommutative Version of the Disc Algebra

You Qing Ji, Liu Zhi, Yuanhang Zhang

Complex Analysis and Operator Theory

DOI

2015

On a factorization of operators as a product of an essentially unitary operator and a strongly irreducible operator

Geng Tian, Yang Cao, You Qing Ji, Juexian Li

Journal of Mathematical Analysis and Applications

DOI

2015

A 𝐶*-algebra approach to complex symmetric operators

Kunyu Guo, You Qing Ji, Sen Zhu

Transactions of the American Mathematical Society

DOI

2014

Operators similar to their restrictions to invariant subspaces

You Qing Ji, Xinjun Xu

Journal of Mathematical Analysis and Applications

DOI

2012

Connectedness of the invertibles in certain nest algebras of order type ω

You Qing Ji, Yuanhang Zhang

Journal of Functional Analysis

DOI

2011

The class of complex symmetric operators is not norm closed

Sen Zhu, Chun Guang Li, You Qing Ji

Proceedings of the American Mathematical Society

DOI

2011

Similarity orbits in the Calkin algebra

Sen Zhu, You Qing Ji

Science China Mathematics

DOI

2011

Stable ranks of split extensions of Banach algebras

You Qing Ji, Yuanhang Zhang

Linear Algebra and its Applications

DOI

2011

An example of weakly amenable and character amenable operator

Luoyi Shi, You Qing Ji

Illinois Journal of Mathematics

DOI

2009

Strongly approximative similarity of operators

You Qing Ji, Sen Zhu

Acta Mathematica Sinica English Series

DOI

2008

Topological stable rank of nest algebras

Kenneth R. Davidson, You Qing Ji

Proceedings of the London Mathematical Society

DOI

2007

有限BIR分解在相似下唯一的一类算子

纪友清，王春梅

《数学学报(中文版)》

2006

Bounded Hankel Products on the Weighted Bergman Space

卢玉峰，尚书霞，纪友清

Communications in Mathematical Research

2005

算子的本性相似

纪友清，王鹏辉，徐新军

《数学学报(中文版)》

2005

单叶算子的(U+K)轨道闭包及Putnam定理

张敏，纪友清

《吉林大学学报(理学版)》

2005

算子的超不变子空间与Wolf谱

徐新军，纪友清

《吉林大学学报(理学版)》

2005

(U+K)-Orbit Closure of Univalent Operator and Its Putnam Theorem

You Qing Ji

Journal of Jilin University

2005

Hyperinvariant Subspaces and Wolf Spectrum of Operators

You Qing Ji

Journal of Jilin University

2004

Jordanian Canonical Form of Quasinormal Operator

徐新军，王鹏辉，纪友清

Communications in Mathematical Research

2004

The Quasiapproximate $(\mathcal{U} + \mathcal{K})$ ?Invariants of Essentially Normal Operators

You Qing Ji, Jue Xian Li

Integral Equations and Operator Theory

DOI

2003

算子权移位的本质谱和Banach约化性

李觉先，纪友清，孙善利

《数学学报(中文版)》

2002

Small compact perturbation of strongly irreducible operators

You Qing Ji, Chun Lan Jiang

Integral Equations and Operator Theory

DOI

2001

Jordanian Canonical Form Theory in an Infinite Dimensional Operator Algebra

纪友清

Communications in Mathematical Research

2001

A characterization of bilateral operator weighted shifts being Cowen-Douglas operators

You Qing Ji, Juexian Li, Yihua Yang

Proceedings of the American Mathematical Society

DOI

2000

强不可约分解在相似下惟一的一类算子

纪友清，杨轶华

《吉林大学学报(理学版)》

2000

THE -ORBIT OF ESSENTIALLY NORMAL OPERATORS AND COMPACT PERTURBATIONS OF STRONGLY IRREDUCIBLE OPERATORS

You Qing Ji, Chunlan Jiang, Zongyao Wang

Chinese Annals of Mathematics Series B

DOI

2000

The (u+κ)-orbit of essentially normal operators and compact perturbations of strongly irreducible operators-orbit of essentially normal operators and compact perturbations of strongly irreducible operators

You Qing Ji, Jiang Chunlan, Wang Zonyao

Chinese Annals of Mathematics Series B

DOI

1999

连续套代数中强不可约算子的酉轨道闭包

纪友清，蒋春澜，王宗尧

《数学学报(中文版)》

1999

算子权移位与Cowen-Douglas算子

李觉先，纪友清

《吉林大学学报(理学版)》

1999

紧扰动下的谱连通算子是强不可约的

蒋春澜，纪友清

《中国科学:数学》

1999

The Quasiapproximate (+)-invariants of Essentially Normal Operators

纪友清，李觉先，孙善利

Communications in Mathematical Research

1999

Operators with connected spectrum + compact operators = strongly irreducible operators

Chunlan Jiang, You Qing Ji

Science in China Series A Mathematics

DOI

1999

Quasitriangular + small compact = strongly irreducible

You Qing Ji

Transactions of the American Mathematical Society

DOI

1997

The strongly irreducible operators in nest algebras

You Qing Ji, Chun Lan Jiang, Zong Yao Wang

Integral Equations and Operator Theory

DOI

1996

套代数中强不可约算子的酉轨道闭包和逼近定理

纪友清

Communications in Mathematical Research

精选作品

期刊论文

Banach空间上拟幂零算子的幂集

Power-regularity of weighted shift operators

Power set of some quasinilpotent weighted shifts on ℓ

Maximal numerical ranges of certain classes of operators and approximation

On the Power Set of Quasinilpotent Operators

Power Set of Some Quasinilpotent Weighted Shifts

套代数的可逆元群连通性及相关问题

Connecting invertible analytic Toeplitz operators in G(T(P⊥))

应用泛函分析

On linear maps preserving complex symmetry

On operators with closed numerical ranges

Operators with closed numerical ranges in nest algebras

复变函数

On the Topological Stable Rank of a Noncommutative Version of the Disc Algebra

On a factorization of operators as a product of an essentially unitary operator and a strongly irreducible operator

A 𝐶*-algebra approach to complex symmetric operators

Operators similar to their restrictions to invariant subspaces

Connectedness of the invertibles in certain nest algebras of order type ω

The class of complex symmetric operators is not norm closed

Similarity orbits in the Calkin algebra

Stable ranks of split extensions of Banach algebras

An example of weakly amenable and character amenable operator

Strongly approximative similarity of operators

Topological stable rank of nest algebras

有限BIR分解在相似下唯一的一类算子

Bounded Hankel Products on the Weighted Bergman Space

算子的本性相似

单叶算子的(U+K)轨道闭包及Putnam定理

算子的超不变子空间与Wolf谱

(U+K)-Orbit Closure of Univalent Operator and Its Putnam Theorem

Hyperinvariant Subspaces and Wolf Spectrum of Operators

Jordanian Canonical Form of Quasinormal Operator

The Quasiapproximate $(\mathcal{U} + \mathcal{K})$ ?Invariants of Essentially Normal Operators

算子权移位的本质谱和Banach约化性

Small compact perturbation of strongly irreducible operators

Jordanian Canonical Form Theory in an Infinite Dimensional Operator Algebra

A characterization of bilateral operator weighted shifts being Cowen-Douglas operators

强不可约分解在相似下惟一的一类算子

THE -ORBIT OF ESSENTIALLY NORMAL OPERATORS AND COMPACT PERTURBATIONS OF STRONGLY IRREDUCIBLE OPERATORS

The (u+κ)-orbit of essentially normal operators and compact perturbations of strongly irreducible operators-orbit of essentially normal operators and compact perturbations of strongly irreducible operators

连续套代数中强不可约算子的酉轨道闭包

算子权移位与Cowen-Douglas算子

紧扰动下的谱连通算子是强不可约的

The Quasiapproximate (+)-invariants of Essentially Normal Operators

Operators with connected spectrum + compact operators = strongly irreducible operators

Quasitriangular + small compact = strongly irreducible

The strongly irreducible operators in nest algebras

套代数中强不可约算子的酉轨道闭包和逼近定理

预印本

Asymptotic Numerical Ranges and Invariant Subspaces of Operators

Schauder Bases and Operator Theory II: (SI) Schauder Operators

书籍章节

The (U + K)-Orbit of Essentially Normal Operators and Compact Perturbation of Strongly Irreducible Operators

研究方向