The family of Kerr solutions, with $|a|<m$, is shown to be the unique pseudostationary family of black-hole solutions of the Einstein vacuum field equations when the event horizon is assumed to be nondegenerate.
No takes yet. Share an insight, caveat, or question.
David Robinson (1975) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: