3-sphere by Ciro Santilli 37 Updated 2025-07-16
Diffeomorphic to .
A 3-sphere, often denoted as \( S^3 \), is a higher-dimensional analogue of a sphere. In simple terms, it is the set of points in four-dimensional Euclidean space (\( \mathbb{R}^4 \)) that are at a constant distance (the radius \( r \)) from a central point (the origin).

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