# 3-torus

(Redirected from Three-torus model of the universe)
The three-dimensional torus, or 3-torus, is defined as any topological space that is homeomorphic to the Cartesian product of three circles, ${\displaystyle \mathbb {T} ^{3}=S^{1}\times S^{1}\times S^{1}.}$ In contrast, the usual torus is the Cartesian product of only two circles.