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Hopf Fibration Explorer — 霍普夫纤维化探索器
Drag a point on the base sphere S² and watch its Hopf fiber — a great circle of S³ — stereographically projected to a perfect circle in R³: nested tori of linking Villarceau circles, the Gauss linking integral, and the SU(2)/Bloch-sphere physics behind the fibration.
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