2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52722Higher-order invariants and their role as possible counterterms for supergravity theories are reviewed. It is argued that N=8 supergravity will diverge at 5 loops. The construction of $R^4$ superinvariants in string and M-theory is discussed.Contribution to Deserfest: A celebration of the life and work of Stanley Deser, Ann Arbor, Michigan, April 3-5 2004. 12 pagesHigh Energy Physics - Theorytext