C. Mädler

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math.FA2023

On the Matricial Truncated Moment Problem. II

Conrad Mädler, Konrad Schmüdgen

We continue the study of truncated matrix-valued moment problems begun in arXiv:2310.00957. Let $q \in N$ . Suppose that $(X, X)$ is a measurable space an…

math.FA2023

On the Truncated Matricial Moment Problem. I

Conrad Mädler, Konrad Schmüdgen

This paper is about the general truncated matrix-valued moment problem. Let $H_{q}$ denote the complex Hermitian $q \times q$ -matrices, $q \in N$ . Suppose that $(\ma…

math.FA2016

A necessary condition for certain functions to preserve positive semi-definiteness on partitioned matrices

Lutz Klotz, Conrad Mädler

If $f$ is a symmetric complex-valued function on the $m$ -fold Cartesian product of the set of non-negative reals and $A$ is a positive semi-definite $m \times m$ matrix with eigenva…