Stability of the inverse Sturm–Liouville problem on a graph with a cycle

In this paper, the Sturm–Liouville operators on a graph with a cycle are considered. We study the inverse spectral problem, which consists in the recovery of the potentials from several spectra and a sequence of signs related to the quasiperiodic problem on the loop. The local stability of this inverse problem on the whole graph is proved. In addition, we investigate its uniform stability. © 2025 Walter de Gruyter GmbH, Berlin/Boston.