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math.FA2023
Which hyponormal block Toeplitz operators are either normal or analytic?
Senhua Zhu, Yufeng Lu, Chao Zu
In this paper, we continue Curto-Hwang-Lee's work to study the connection between hyponormality and subnormality for block Toeplitz operators acting on the vector-valued Hardy spac…
math.DS2023
The dissipativity and controllability of input affine systems
Qin Xu, Liu Liu, Yufeng Lu
The paper is considered with the dissipative theory and feedback control under the framework of dissipation with the supply rate is the inner product of input u and the derivation…
math.FA2023
Hankel operators on vector-valued Bergman spaces with exponential weights
Jian-xiang Dong, Yu-feng Lu
Let be a separable Hilbert space and let be the -valued Bergman spaces with exponential weights. In the present paper, we give the…