2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/172416In this short note we discuss the influence of a time-periodic dissipation term on a-priori estimates for solutions to dissipative wave equations. The approach is based on a diagonalisation argument for high frequencies and results from spectral theory of periodic differential equations / Floquet theory for bounded frequencies.9 pagesAnalysis of PDEsClassical Analysis and ODEs35L05, 35L15text