Stereographic Projection of a 3-Sphere

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A four-dimensional hypersphere of radius and center
has equation
. The unit 3-sphere is the four-dimensional hypersphere of radius
and center
. This Demonstration lets you rotate the unit 3-sphere around its six directional planes (
-
,
-
,
-
,
-
,
-
,
-
), showing the stereographic projection of its parallels, meridians, and hypermeridians in three-dimensional space. Although the circles seen in 3D seem to intersect themselves when the hypersphere is rotated, in 4D, the 3-sphere does not self-intersect.
Contributed by: John Na (August 2014)
(Mathematica Summer Camp 2014)
Open content licensed under CC BY-NC-SA
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"Stereographic Projection of a 3-Sphere"
http://demonstrations.wolfram.com/StereographicProjectionOfA3Sphere/
Wolfram Demonstrations Project
Published: August 6 2014