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black hole uniqueness theorems

Theorems proved in the context of general relativity that answer the question: How many different kinds of black holes are there? If that question is restricted to stationary black holes (namely black holes that have settled down and do not change over time), then the answer is: Surprisingly few. Once you know a stationary black hole's mass, angular momentum (roughly speaking, how fast it rotates) and electric charge, its properties are determined completely.

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