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There exists in General Relativity an unambiguous notion of Mass associatedto asymptotically flat spacetimes known as the ADM mass. The standardexpression for the same is a surface integral over spatial infinity of a linearcombination of spatial deriatives of the three metric adapted to a constanttime spatial hypersurface evaluated at infinity. In this form however thepositivity of this mass formula is not apparent, so in the following an attemptshall be made to bring this functional into a form where it's positivity isevident.

Proof of Positivity of Mass for Maximally Sliced, Asymptotically Flat Spacetimes