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JMB Journal of Microbiolog and Biotechnology

OPEN ACCESS eISSN 0454-8124
pISSN 1225-6951
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Kyungpook Mathematical Journal 2022; 62(1): 107-118

Published online March 31, 2022

Copyright © Kyungpook Mathematical Journal.

Truncated Multi-index Sequences Have an Interpolating Measure

Hayoung Choi, Seonguk Yoo*

Department of Mathematics, Kyungpook National University, Daegu 41566, Republic of Korea
e-mail : hayoung.choi@knu.ac.kr

Department of Mathematics Education and RINS, Gyeongsang National University, Jinju 52828, Republic of Korea
e-mail : seyoo@gnu.ac.kr

Received: June 2, 2021; Revised: November 10, 2021; Accepted: November 15, 2021

Abstract

In this note we observe that any truncated multi-index sequence has an interpolating measure supported in Euclidean space. It is well known that the consistency of a truncated moment sequence is equivalent to the existence of an interpolating measure for the sequence. When the moment matrix of a moment sequence is nonsingular, the sequence is naturally consistent; a proper perturbation to a given moment matrix enables us to confirm the existence of an interpolating measure for the moment sequence. We also illustrate how to find an explicit form of an interpolating measure for some cases.

Keywords: moment problem, interpolating measure, consistency, rank-one decomposition