Linked from
The 49 pages that link to Einstein field equations, each with the reason it gives.
Kerr metricNarrower topic: The Kerr metric is an exact vacuum solution of these equations.
Karl SchwarzschildNarrower topic: Their vacuum form is the system Schwarzschild solved exactly.
Kerr–Newman metricNarrower topic: Their gravitational part governs the geometry in the solution.
Rotating black holeNarrower topic: The Kerr solution satisfies these equations in vacuum.