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if "r" and "p" in the above flat torus form a unit vector = then "u", "v", and "η" can be used to parameterize the unit 3-sphere in a parameterization associated with the hopf map.
if "r" and "p" in the above flat torus form a unit vector = then "u", "v", and "η" can be used to parameterize the unit 3-sphere in a parameterization associated with the hopf map.