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This problem seems hard, then it doesn't, but it really is

2100914
4/8/2019
The famous (infamous?) "windmill" problem on the 2011 IMO
Home page: https://www.3blue1brown.com
Brought to you by you: http://3b1b.co/windmillthanks

The author of this problem was Geoff Smith. You can find the full list of problems considered for the IMO that year, together with their solutions, here:
https://www.imo-official.org/problems...

You can find data for past IMO results here:
https://www.imo-official.org/

Viewer-created interactive about this problem:
https://www.reddit.com/r/3Blue1Brown/...

I made a quick reference to "proper time" as an example of an invariant. Take a look at this minutephysics video if you want to learn more.
https://youtu.be/WFAEHKAR5hU

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These animations are largely made using manim, a scrappy open-source python library: https://github.com/3b1b/manim

If you want to check it out, I feel compelled to warn you that it's not the most well-documented tool, and it has many other quirks you might expect in a library someone wrote with only their own use in mind.

Music by Vincent Rubinetti.
Download the music on Bandcamp:
https://vincerubinetti.bandcamp.com/a...

Stream the music on Spotify:
https://open.spotify.com/album/1dVyjw...

If you want to contribute translated subtitles or to help review those that have already been made by others and need approval, you can click the gear icon in the video and go to subtitles/cc, then "add subtitles/cc". I really appreciate those who do this, as it helps make the lessons accessible to more people.

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3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with YouTube, if you want to stay posted on new videos, subscribe: http://3b1b.co/subscribe

Various social media stuffs:
Website: https://www.3blue1brown.com
Twitter: https://twitter.com/3blue1brown
Reddit: https://www.reddit.com/r/3blue1brown
Instagram: https://www.instagram.com/3blue1brown...
Patreon: https://patreon.com/3blue1brown
Facebook: https://www.facebook.com/3blue1brown
Mathematics three blue one brown 3 blue 1 brown 3b1b 3brown1blue 3 brown 1 blue three brown one blue international math olympiad imo imo problem 2
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