3Blue1Brown The absurd circle division pattern explained | Moser’s circle problem
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📺 3Blue1Brown — @3blue1brown
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An apparent pattern that breaks, and the reason behind it.
Summer of math exposition:
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For the long-time viewers among you, if this sounds familiar, it’s because it’s a remake of one of the earliest videos on the channel. It’s such a wonderful problem, and the audio/pacing in earlier videos was really suboptimal, so I wanted to freshen it up a little here.
Timestamps
0:00 - The pattern
2:20 - Counting chords
4:03 - Counting intersection points
6:20 - Euler’s characteristic formula
11:30 - Connection with Pascal’s triangle
15:10 - Reflections
15:55 - SoME3
Correction at 8:56 - The number of the regions should of course be (1, 2, 3, 4, 5), instead of (0,1,2,3,5)
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These animations are largely made using a custom python library, manim. See the FAQ comments here:
#manim
You can find code for specific videos and projects here:
Music by Vincent Rubinetti.
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