2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161612Analyzing the order of unobservable impulse in descriptor system leads to a new testing criterion for impulse observability, both the statement and the proof of which use only the original system data.10 pagesOptimization and ControlClassical Analysis and ODEs93B05; 93B07; 93B10text