2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100875We show that strictly convex surfaces contracting with normal velocity equal to |A|^2 shrink to a point in finite time. After appropriate rescaling, they converge to spheres. We indicate how we used a computer to find the main test function.41 pages; minor correctionsDifferential Geometry53C44; 68W20; 35B40text