2026-05-05T19:40:53Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/654022025-10-30T12:38:38Zcom_10324_1176com_10324_931com_10324_894col_10324_1359

Ruling out certain 5-spectra with one repeated eigenvalue for the symmetric NIEP Marijuán López, Carlos Pisonero Pérez, Miriam Here, prior work, that ruled out certain spectra with two repeated eigenvalues for the 5-by-5 S-NIEP, is extended. Previously unresolved spectra with just one repeated eigenvalue are shown not to occur. The repeat could be either positive or negative, but the two situations are different. In both situations, the prior result with two repeats is a special case. 2024-01-31T00:43:06Z 2024-01-31T00:43:06Z 2024-01-31T00:43:06Z 2021 info:eu-repo/semantics/article Linear Algebra and its Applications 612 (2021) 75–98 0024-3795 https://uvadoc.uva.es/handle/10324/65402 10.1016/j.laa.2020.12.004 75 612 98 Linear Algebra and its Applications 612 eng https://doi.org/10.1016/j.laa.2020.12.004 info:eu-repo/semantics/restrictedAccess © 2020 Elsevier Inc. All rights reserved. Elsevier