Let $S^{1}=\left \{(x, y) : x^{2}+y^{2}=1 \right \}\subseteq \mathbb{R}^{2}$ be the unit circle. What familiar shape is $S^{1}×S^{1}$?
2026-03-27 08:56:42.1774601802
Cartesian Product; The Topology of $\mathbb{R}^{n}$
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