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A 13-minute video by 3Blue1Brown about pure mathematics, on the Mathematics shelf. It came up in 2 Reddit threads, in r/3Blue1Brown.
3Blue1Brown, Video, 13 min, 2018, on the Mathematics shelf
Derives why a conic slice is an ellipse using the geometry of Dandelin spheres.
Derives why a conic slice is an ellipse using the geometry of Dandelin spheres.
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