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From the 3 of 28 papers with an AI index.

most citedQuantum unital Otto heat engines: using Kirkwood-Dirac quasi-probability for the engine's coherence to stay alive

7 citations

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math.FA2026

The Quaternionic Moment Problem

R. Ben Taher, K. Schmüdgen, E. H. Zerouali

In this paper we develop an approach to the full quaternionic moment problem. We define a hierarchy , $k\in \mathbb{N}_…

math.FA2026★ 4 cited

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…

math.FA2026

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…

math.FA2026

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} =…

math.FA2026

The Square Root Problem and Subnormal Aluthge Transforms of Recursively Generated Weighted Shifts

Raul E. Curto, Hamza El Azhar, Youssef Omari +1

For recursively generated shifts, we provide definitive answers to two outstanding problems in the theory of unilateral weighted shifts: the Subnormality Problem ({\bf SP}) (relate…