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Motivated by open problems in F-theory, we reconsider warped compactifications of M-theory on 8-manifolds to AdS 3 spaces in the presence of a non-trivial field strength of the M-theory 3-form, studying the most general conditions under which such backgrounds preserve N = 2 supersymmetry in three dimensions. In contrast with previous studies, we allow for the most general pair of Majorana generalized Killing pinors on the internal 8-manifold, without imposing any chirality conditions on thosedoi:10.1063/1.4832797 fatcat:wtagnjie2rf6fdhdcos62jd57y