Anderson, Brian D.O.Clements, David J.2026-01-272026-01-270005-1098ORCID:/0000-0002-1493-4774/work/174739766https://hdl.handle.net/1885/733804965Algebraic characterizations are presented for the existence of fixed modes of a linear closed-loop system with decentralized feedback control. The class of controllers for which fixed modes are present is extended beyond that currently known.enControllersdecentralized controlfeedbacklarge-scale systemsmultivariable control systemsstabilizers198110.1016/0005-1098(81)90017-00019610586