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14 Summary: Achievements, Difficulties, and Open Issues

In the previous sections we tried to give an objective review of the present state of the art. This section is, however, less positivistic: We close the present review by a critical discussion, evaluating those 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 the Hawking energy
 14.2 On the Penrose mass
 14.3 On the Dougan-Mason energy-momenta and the holomorphic/anti-holomorphic spin angular momenta
 14.4 On the Brown-York-type expressions

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