= Jorge Zanelli
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<Jorge Zanelli> co-discovered a black-hole solution in three-dimensional spacetime with <Máximo Bañados> and <Claudio Teitelboim>. The <BTZ black hole> exists with a negative <cosmological constant> and has global horizon and thermodynamic properties despite the simpler local geometry of three-dimensional gravity.<The Black Hole in Three Dimensional Spacetime by Máximo Bañados and others>[Abstract and black-hole geometry]{ref}
The example separates global spacetime structure from the local curvature description.
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