Wente torus
In differential geometry, a Wente torus is an immersed torus in of constant mean curvature, discovered by Template:Harvs. It is a counterexample to the conjecture of Heinz Hopf that every closed, compact, constant-mean-curvature surface is a sphere (though this is true if the surface is embedded). There are similar examples known for every positive genus.
References
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- The Wente torus, University of Toledo Mathematics Department, retrieved 2013-09-01.