2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50011We show how some aspects of the K-theory classification of RR fluxes follow from a careful analysis of the phase of the M-theory action. This is a shortened and simplified companion paper to ``E8 Gauge Theory, and a Derivation of K-Theory from M-Theory.''16pp. harvmac b-mode; small mistake correctedHigh Energy Physics - Theorytext