Abstract
All three-dimensional matter-free space-times with negative cosmological constant, compatible with cyclic symmetry, are identified. The only cyclic solutions are the 2+1 (BTZ) black hole with SO(2)×R isometry, and the self-dual Coussaert-Henneaux space-times, with isometry groups SO(2)×SO(2,1) or SO(2)×SO(2).

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