topologically the torus, is a Lorentz surface that is called the Clifton–Pohl torus. Sometimes, by extension, a surface is called a Clifton–Pohl torus if it is...

Pohl (16 September 1937 – 9 December 1988) was an American mathematician, specializing in differential geometry and known for the Clifton–Pohl torus....

example, the metric tensor becomes zero on any light-like curve. The Clifton–Pohl torus provides an example of a pseudo-Riemannian manifold that is compact...

pseudo-Riemannian (but not Riemannian) manifolds. An example of this is the Clifton–Pohl torus. In the theory of general relativity, which describes gravity in terms...

generalize to Lorentzian manifolds: the Clifton–Pohl torus provides an example (diffeomorphic to the two-dimensional torus) that is compact but not complete...

earthquakes, and when angered can unintentionally kill living things in their "torus", or area of influence, by extracting the heat from their bodies to use...

Dyson sphere Megastructure Orbital (The Culture) Orbital ring Stanford torus "1970 Award Winners & Nominees". Worlds Without End. Retrieved 2009-07-20...