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Visualizing quaternions (4d numbers) with stereographic projection

Exactly how to consider this 4d number system in our 3d area.
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Quanta post on quaternions:

The mathematics of Alice in Wonderland:

0:00 – Intro
4:14 – Linus the linelander
11:03 – Felix the flatlander
17:25 – Mapping 4d to 3d
23:18 – The geometry of quaternion reproduction


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Songs by Vincent Rubinetti:


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