3 papers
math.FA2026
Closed Range and Essential Norms of Composition Operators on Weighted Dirichlet Spaces
Caixing Gu, Li He, Xiaofeng Wang +1
We study closed range and essential norms of bounded composition operators on weighted Dirichlet spaces . For , we first consider maps whose images are…
math.FA2025
Polynomial Approximation in Higher-Order Weighted Dirichlet Spaces
Yuanhao Yan, Li He
Fejér's theorem guarantees norm convergence of Cesàro means of Taylor partial sums in the Hardy space, whereas such convergence generally fails in weighted Dirichlet-type spaces, e…
physics.app-ph2025
Observation of Coherent Perfect Acoustic Absorption at an Exceptional Point
Yi-Fei Xia, Zi-Xiang Xu, Yu-Ting Yan +5
Non-Hermitian systems have recently shown new possibilities to manipulate wave scattering by exploiting loss, yet coherent perfect absorption at an exceptional point (CPA EP) remai…