2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/203574We derive anomaly constraints for Abelian and non-Abelian discrete symmetries using the path integral approach. We survey anomalies of discrete symmetries in heterotic orbifolds and find a new relation between such anomalies and the so-called `anomalous' U(1).32 pages, one figure; v2: matches version published in NPBHigh Energy Physics - Theorytext