video thumbnail 18:48
How to lie using visual proofs

2022-07-03

[public] 172K views, 115K likes, dislikes audio only

channel thumb3Blue1Brown
4K

Three false proofs, and what lessons they teach.

New notebooks: https://store.dftba.com/collections/3blue1brown/products/mathematical-quotebook-notebook

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An equally valuable form of support is to simply share the videos.

Here's a nice short video on the false pi = 4 proof

https://www.youtube.com/watch?v=6Qnfd5dRyf4

Time stamps:

0:00 - Fake sphere proof

1:39 - Fake pi = 4 proof

5:16 - Fake proof that all triangles are isosceles

9:54 - Sphere "proof" explanation

15:09 - pi = 4 "proof" explanation

16:57 - Triangle "proof" explanation and conclusion

Thanks to these viewers for their contributions to translations

French: azerty314159

Portuguese: Wagner K. Martins

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These animations are largely made using a custom python library, manim. See the FAQ comments here:

https://www.3blue1brown.com/faq#manim

https://github.com/3b1b/manim

https://github.com/ManimCommunity/manim/

You can find code for specific videos and projects here:

https://github.com/3b1b/videos/

Music by Vincent Rubinetti.

https://www.vincentrubinetti.com/

Download the music on Bandcamp:

https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown

Stream the music on Spotify:

https://open.spotify.com/album/1dVyjwS8FBqXhRunaG5W5u

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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

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Fake pi = 4 proof
/youtube/video/VYQVlVoWoPY?t=99
But why is a sphere's surface area four times its shadow? by 3Blue1Brown
/youtube/video/GNcFjFmqEc8
Fake sphere proof
/youtube/video/VYQVlVoWoPY?t=0
Fake proof that all triangles are isosceles
/youtube/video/VYQVlVoWoPY?t=316
Sphere "proof" explanation
/youtube/video/VYQVlVoWoPY?t=594
pi = 4 "proof" explanation
/youtube/video/VYQVlVoWoPY?t=909
Triangle "proof" explanation and conclusion
/youtube/video/VYQVlVoWoPY?t=1017
But what is a convolution? 1,301,586 views
/youtube/video/KuXjwB4LzSA
Mathematical Quotebook Notebook store.dftba.com
https://store.dftba.com/collections/3blue1brown/products/mathematical-quotebook-notebook