2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201665Degeneracies near the real axis in a complex-extended parameter space of a hermitian Hamiltonian are studied. We present a method to measure distributions of such degeneracies on the Riemann sheet of a selected level and apply it in classification of quantum phase transitions. The degeneracies are shown to behave similarly as complex zeros of a partition function.4 pagesQuantum PhysicsMathematical PhysicsNuclear Theorytext