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Schlagwörter:
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Zusammenfassung:
We consider stationary, axially and equatorially symmetric systems consisting of a central rotating and charged degenerate black hole and surrounding physically realistic matter. We show that $a^2+Q^2=M^2$ always holds, where $a=J/M$ is the black hole's intrinsic angular momentum per unit mass, $Q$ its electric charge and $M$ the well known black hole mass parameter introduced by Christodoulou and Ruffini.
