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pro vyhledávání: '"Mädler, Conrad"'
This paper is dedicated to the introduction in a circle of ideas and methods, which are connected with the notion of characteristic function of a non-selfadjoint operator. We start with the consideration of closed and open systems (Subsections 2.1.1-
Externí odkaz:
http://arxiv.org/abs/2312.17333
In [19] there is an approach to the investigation of the pseudocontinuability of Schur functions in terms of Schur parameters. In particular, there was obtained a criterion for the pseudocontinuability of Schur functions and the Schur parameters of r
Externí odkaz:
http://arxiv.org/abs/2312.17189
Autor:
Boiko, Sergey S., Dubovoy, Vladimir K., Fritzsche, Bernd, Kirstein, Bernd, Mädler, Conrad, Müller, Karsten
In this paper we would like to show the interrelation between the different mathematical theories concerning the Schur interpolation problem, contractions in Hilbert spaces, pseudocontinuation and Darlington synthesis. The main objects of this articl
Externí odkaz:
http://arxiv.org/abs/2312.17177
Autor:
Mädler, Conrad, Schmüdgen, Konrad
We continue the study of truncated matrix-valued moment problems begun in arXiv:2310.00957. Let $q\in\mathbb{N}$. Suppose that $(\mathcal{X},\mathfrak{X})$ is a measurable space and $\mathcal{E}$ is a finite-dimensional vector space of measurable map
Externí odkaz:
http://arxiv.org/abs/2311.10179
Autor:
Mädler, Conrad, Schmüdgen, Konrad
This paper is about the general truncated matrix-valued moment problem. Let $\mathcal{H}_q$ denote the complex Hermitian $q\times q$-matrices, $q\in \mathbb{N}$. Suppose that $(\mathcal{X},\mathfrak{X})$ is a measurable space and $\mathcal{E}$ is a f
Externí odkaz:
http://arxiv.org/abs/2310.00957
Publikováno v:
In Linear Algebra and Its Applications 15 September 2024 697:639-687
Autor:
Mädler, Conrad, Schmüdgen, Konrad
Publikováno v:
In Linear Algebra and Its Applications 1 December 2024 702:63-97
Autor:
Mädler, Conrad, Schmüdgen, Konrad
Publikováno v:
In Journal of Mathematical Analysis and Applications 1 December 2024 540(1)
The main goal of the paper is to parametrize the Weyl matrix balls associated with an arbitrary matricial truncated Hamburger moment problem. For the special case of a non-degenerate matricial truncated Hamburger moment problem the corresponding Weyl
Externí odkaz:
http://arxiv.org/abs/2109.11900
Autor:
Fritzsche, Bernd, Mädler, Conrad
In this paper, new block representations of Moore-Penrose inverses for arbitrary complex $2\times2$ block matrices are given. The approach is based on block representations of orthogonal projection matrices.
Externí odkaz:
http://arxiv.org/abs/2102.02101