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The opening page of Schoen and Yau's paper "On the Proof of the Positive Mass Conjecture in General Relativity." The abstract reads: "Let M be a space-time whose local mass density is non-negative everywhere. Then we prove that the total mass of M as viewed from spatial infinity (the ADM mass) must be positive unless M is the flat Minkowski space-time. (So far we are making the reasonable assumption of the existence of a maximal spacelike hypersurface. We will treat this topic separately.) We can generalize our result to admit wormholes in the initial-data set.In fact, we show that the total mass associated with each asymptotic regime is non-negative with equality only if the space-time is flat."