2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155023We consider Fourier integral operators with symbols in modulation spaces and non-smooth phase functions whose second orders of derivatives belong to certain types of modulation space. We establish continuity and Schatten-von Neumann properties of such operators when acting on modulation spaces.34 pagesAnalysis of PDEsFunctional Analysistext