Assertion: torus | /r/HasProperty | flat
Facets:
Source sentences:
text: The rectangle picture of the torus is a demonstration of the fact that the torus is flat.
text: Although it is usually assumed in the literature that a flat or negatively curved universe is infinite, this need not be the case if the topology is not the trivial one: for example, a three-torus is flat but finite.
text: For example, Euclidean space is flat, simply connected, and infinite, but the torus is flat, multiply connected, finite, and compact.