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All flat manifolds are cusps of hyperbolic orbifolds
2002
Algebraic and Geometric Topology
We show that all closed flat n-manifolds are diffeomorphic to a cusp cross-section in a finite volume hyperbolic (n+1)-orbifold.
doi:10.2140/agt.2002.2.285
fatcat:hgwm4hl5tnbp5afyfxubovqzsu