2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/171616We give a simple proof of the insoperimetric inequality for quermassintegrals of non-convex starshaped domains, using a reslut of Gerhardt \cite{G} and Urbas \cite{U} on an expanding geometric curvature flow.7 pagesDifferential GeometryAnalysis of PDEs52A40, 35J60text