Reversible and Irreversible Transformations in Black-Hole Physics

The concepts of irreducible mass and of reversible and irreversible transformations in black holes are introduced, leading to the formula ${E}^{2}=m_{\mathrm{ir}}^{2}+(\frac{{L}^{2}}{4m_{\mathrm{ir}}^{2}})+{p}^{2}$ for a black hole of linear momentum $p$ and angular momentum $L$.

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