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A 4-minute video by Physics Videos by Eugene Khutoryansky, on the Mathematics shelf. It came up in r/3Blue1Brown, in a thread called “More 3Blue1Brown video suggestions”.
Physics Videos by Eugene Khutoryansky, Video, 4 min, 2015, on the Mathematics shelf
Rotation of 4D tetrahedrons, tesseracts, and spheres.
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Why There's 'No' Quintic Formula (proof without Galois theory)not all wrongMentioned in r/math
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