2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67871A generalisation of the Cassels and Greub-Reinboldt inequalities in complex or real inner product spaces and applications for isotonic linear functionals, integrals and sequences are provided.Classical Analysis and ODEsFunctional Analysis26D15, 26D10, 46C05text