2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219636We define a measure of spectral asymmetry for G_2 and Spin(7) manifolds. We show that this invariant can be computed in terms of characteristic classes and the covariant constant form defining the G_2 or Spin(7) structure.9 pagesDifferential Geometrytext