Kunyu Guo

activity

20242026

collaborators

4 papers

math.FA2026

On the existence of independent inner functions

Xiangdi Fu, Kunyu Guo, Dilong Li +1

The existence of independent inner functions is established: there exist inner functions $φ$ and $ψ$ , both vanishing at the origin, such that $$ \frac{1}{2π}\int_0^{2π} φ^m(e^{iθ})…

math.FA2026

Weighted Frames and the Douglas-Foias problem

Hui Dan, Kunyu Guo, Dilong Li

Let $T = (T_{1}, \dots, T_{n})$ be a commuting tuple of bounded linear operators on a separable Hilbert space $K$ , and let ${a_{α}}_{α \in Z_{+}^{n}}$ be strictly po…

math.FA2025

Contractive projections, conditional expectations, and idempotent coefficient multipliers on $H^{p}$ spaces $(0 < p < 1)$

Xiangdi Fu, Kunyu Guo, Dilong Li

In this paper, we investigate contractive projections, conditional expectations, and idempotent coefficient multipliers on the Hardy spaces $H^{p} (T)$ for $0 < p < 1$ . For such…

math.FA2024

Extension of contractive projections