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A maximum principle for C^0 null hypersurfaces is obtained and used to derivea splitting theorem for spacetimes which contain null lines. As a consequenceof this null splitting theorem, it is proved that an asymptotically simplevacuum (Ricci flat) spacetime which contains a null line is isometric toMinkowski space.Comment: 26 pages, latex2

Maximum Principles for Null Hypersurfaces and Null Splitting Theorems