J 2023

A Note on the Krylov Solvability of Compact Normal Operators on Hilbert Space

CARUSO, Noe Angelo

Basic information

Original name

A Note on the Krylov Solvability of Compact Normal Operators on Hilbert Space

Authors

CARUSO, Noe Angelo (36 Australia, guarantor, belonging to the institution)

Edition

Complex Analysis and Operator Theory, Basel, Switzerland, Springer Basel AG, 2023, 1661-8254

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10101 Pure mathematics

Country of publisher

Switzerland

Confidentiality degree

není předmětem státního či obchodního tajemství

RIV identification code

RIV/47813059:19610/23:A0000145

Organization unit

Mathematical Institute in Opava

UT WoS

001066912100001

Keywords in English

Bounded linear operators; Compact operators; Cyclic operators; Ill-posed problems; Infinite-dimensional Hilbert space; Inverse linear problems; Krylov solution; Krylov solvability; Krylov subspaces; Normal operators

Tags

Tags

International impact, Reviewed
Změněno: 27/3/2024 14:29, Mgr. Aleš Ryšavý

Abstract

V originále

We analyse the Krylov solvability of inverse linear problems on Hilbert space H where the underlying operator is compact and normal. Krylov solvability is an important feature of inverse linear problems that has profound implications in theoretical and applied numerical analysis as it is critical to understand the utility of Krylov based methods for solving inverse problems. Our results explicitly describe for the first time the Krylov subspace for such operators given any datum vector g is an element of H, as well as prove that all inverse linear problems are Krylov solvable provided that g is in the range of such an operator. We therefore expand our knowledge of the class of Krylov solvable operators to include the normal compact operators. We close the study by proving an isomorphism between the closed Krylov subspace for a general bounded normal operator and an L-2-measure space based on the scalar spectral measure.