3-torus
Cartesian product of 3 circles
3-torus
The three-dimensional torus, or 3-torus, is defined as any topological space that is homeomorphic to the Cartesian product of three circles, T 3 = S 1 × S 1 × S 1 . {\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.
Read on Wikipedia · Image Jeff Weeks, GPL
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