4 citations · 4 across the 4 of their papers we have counts for
4 papers
The Local Operator Moment Problem on
Raul E. Curto, Abderrazzak Ech-charyfy, Hamza El Azhar +1
We study the connections between operator moment sequences of self-adjoint operators on a complex Hilbert space a…
Propagation Phenomena for Operator-Valued Weighted Shifts
Raul E. Curto, Abderrazzak Ech-charyfy, Hamza El Azhar +1
This paper is devoted to the study of propagation phenomena for --hyponormal, quadratically hyponormal, and cubically hyponormal operator-valued weighted shifts. \ First, we sho…
A Combinatorial Formula for Recursive Operator Sequences and Applications
Raul E. Curto, Abderrazzak Ech-charyfy, Kaissar Idrissi +1
We study sequences of bounded operators \((T_n)_{n \ge 0}\) on a complex separable Hilbert space \(\mathcal{H}\) that satisfy a linear recurrence relation of the form $$ T_{n+r} =…
A Recursive approach to the matrix moment problem
R. Curto, A. Ech-charyfy, K. Idrissi +1
In this paper, we study the truncated matrix moment problem in one variable through recursive matrix extensions. We give necessary and sufficient conditions for a recursive matrix…