14 Summary: Achievements, Difficulties, and Open Issues

In the previous sections we have tried to give an objective review of the present state of the art. This section is, however, more subjective: We close the present review with a critical discussion, evaluating strategies, approaches etc. that are explicitly and unambiguously given and (at least in principle) applicable in any generic spacetime.

 14.1 On the Bartnik mass and Hawking energy
 14.2 On the Penrose mass
 14.3 On the Dougan–Mason energy-momenta and the holomorphic/antiholomorphic spin angular momenta
 14.4 On the Brown–York–type expressions

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