2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106314We obtain uniqueness theorems for harmonic and subharmonic functions of a new type. They lead to new analytic extension criteria and new conditions for stability of operator semigroups in Banach spaces with Fourier type.Complex VariablesFunctional AnalysisPrimary 47D06, 30H28; Secondary 34D05, 30H50Uniqueness theorems for (sub-)harmonic functions with applications to operator theorytext