video thumbnail 12:51
Why slicing a cone gives an ellipse

2018-08-01

[public] 1.16M views, 56.1K likes, 504 dislikes audio only

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Dandelin spheres, conic sections, and a view of genius in math.

Help fund future projects: https://www.patreon.com/3blue1brown

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

Special thanks to these supporters: http://3b1b.co/dandelin-thanks

Home page: https://www.3blue1brown.com

Thoughts on the recent change to be sponsor-free:

https://www.patreon.com/posts/going-sponsor-19586800

Video on Feynman's lost lecture: /youtube/video/xdIjYBtnvZU

I originally saw the proof of this video when I was reading Paul Lockhart's "Measurement", which I highly recommend to all math learners, young and old.

New shirts/mugs available: http://3b1b.co/store

The 3d animations in the video were done using Grapher, while 2d animations were done using https://github.com/3b1b/manim

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.

Music by Vincent Rubinetti:

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

Thanks to these viewers for their contributions to translations

Hebrew: Omer Tuchfeld

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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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Feynman's Lost Lecture (ft. 3Blue1Brown) by minutephysics
/youtube/video/xdIjYBtnvZU
Patreon Funded via Patreon
http://patreon.com/3blue1brown
Introduction
/youtube/video/pQa_tWZmlGs?t=0
What is an ellipse
/youtube/video/pQa_tWZmlGs?t=38
What is eccentricity
/youtube/video/pQa_tWZmlGs?t=180
Why do this
/youtube/video/pQa_tWZmlGs?t=298
But what is a convolution? 1,301,586 views
/youtube/video/KuXjwB4LzSA
3Blue1Brown 3Blue1Brown, by Grant Sanderson, is some combination of math and entertainment, depending on your disposition. The goal is for explanations to be driven by animations and for difficult problems to be made simple with changes in perspective. For more information, other projects, FAQs, and inquiries see the website: https://www.3blue1brown.com
/youtube/channel/UCYO_jab_esuFRV4b17AJtAw
Feynman's Lost Lecture (ft. 3Blue1Brown) 2,920,841 views
/youtube/video/xdIjYBtnvZU
Support 3blue1brown.com
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