Key points are not available for this paper at this time.
The concepts of irreducible mass and of reversible and irreversible transformations in black holes are introduced, leading to the formula E^2=m₈ₑ^2+ (L^{2}4m₈ₑ^{2}) +p^2 for a black hole of linear momentum p and angular momentum L.
Demetrios Christodoulou (Mon,) studied this question.