= Don N. Page
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<Don N. Page> investigated equilibrium <black-hole thermodynamics> with <Stephen Hawking>. Their 1983 work showed that sufficiently large <black holes> in <Anti-de Sitter spacetime> can have positive <heat capacity> and coexist in stable thermal equilibrium with <radiation>.<Thermodynamics of black holes in anti-de Sitter space by Stephen Hawking and Don N. Page>[Abstract and sections 2–3: temperature branches and canonical ensemble]{ref}
The <canonical ensemble> distinguishes local stability from global preference: a locally stable black-hole solution need not have lower <free energy> than the competing thermal state.
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