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.
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.
Source: Wikipedia "3-torus" · CC BY-SA 4.0
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