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In this article we shall outline a derivation of the analogue of discretetorsion for the M-theory three-form potential. We find that some of thedifferences between orbifold group actions on the C field are classified byH^3(G, U(1)). We also compute the phases that the low-energy effective actionof a membrane on T^3 would see in the analogue of a twisted sector, and notethat they are invariant under the obvious SL(3,Z) action.Comment: 27 pages, LaTeX, 4 figures; v2: typos fixe

Analogues of discrete torsion for the M-theory three-form