2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104755We investigate the Schatten-class properties of pseudo-differential operators with the (revisted) method of Cordes and Kato. As symbol classes we use classes similar to those of Cordes in which the $L^{\infty}$% -conditions are replaced by $L^{p}$-conditions, $1\leq p<\infty $.Analysis of PDEsFunctional Analysis35S05, 43Axx, 46-XX, 47-XX, 42B15, 42B35text