Math

The psychologist Max Wertheimer was friends with Albert Einstein. In 1934, he wrote a letter to Einstein that contained a simple brain teaser. Can you figure it out?Thanks to all patrons! Special thanks to: Shrihari Puranik, Richard Ohnemus, Michael Anvari, Kyle. We are the only channel to feature math topics suggested by people around the
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Check out Brilliant (and get 20% off) by clicking https://brilliant.org/numberphile Featuring Ben Sparks — More links & stuff in full description below ↓↓↓ Golden seeds limited edition T-Shirt: https://teespring.com/NP-Seeds More Golden Ratio stuff: http://bit.ly/Golden_Ratio More Ben Sparks Numberphile videos: http://bit.ly/Sparks_Playlist Ben’s Twitter: https://twitter.com/SparksMaths Ben’s website: www.bensparks.co.uk Geogebra file Ben used: https://www.geogebra.org/m/YThycjQK#material/T8eKzDu5 Note on this video:
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Matt Parker shows off his Magic Square party trick (unlike magicians, mathematicians often reveal their secrets). More links & stuff in full description below ↓↓↓ More Magic Square videos: http://bit.ly/MagicSquareVideos Rubik’s Cube videos: http://bit.ly/rubiksvids More Matt on Numberphile: http://bit.ly/Matt_Videos A little extra bit for this video: https://youtu.be/zhB2AUNcsx0 Parker Square: https://youtu.be/aOT_bG-vWyg Parker Square T-Shirt: http://bit.ly/ParkerSquareTshirt Support
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More links & stuff in full description below ↓↓↓ Abandoning “The Fifth Axiom” – Euclid’s so-called Parallel Postulate – gave birth to a whole new world… the world Hyperbolic Geometry. Featuring Dr Caleb Ashley. Extra footage from this interview: http://youtu.be/0FG-vUSjoAM Filmed at MSRI. More hyperbolic geometry videos soon. http://bit.ly/HyperbolicGeometry Euclid’s Postulates: http://mathworld.wolfram.com/EuclidsPostulates.html Support us on
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Dr James Grime is back and talking about tortoises. More links & stuff in full description below ↓↓↓ In many ways this video follows on from http://www.youtube.com/watch?v=bFNjA9LOPsg and then http://www.youtube.com/watch?v=CMP9a2J4Bqw James Grime’s website is: http://singingbanana.com NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Patreon: http://www.patreon.com/numberphile Brady’s videos
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Thanks to Himanshu from India for sending me this problem! It was part of a math competition where you had about 1 minute to solve each problem (I admit I took much longer). Can you figure out the area of the folded rectangle? Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1 Playlist to watch all videos on MindYourDecisions: https://www.youtube.com/playlist?list=UUHnj59g7jezwTy5GeL8EA_g Thanks to
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Oxford ranks as one of the best universities in the world. Can you solve this problem, which is adapted from an admission interview question? Source http://www.ox.ac.uk/admissions/undergraduate/applying-to-oxford/guide/interviews Desmos animation https://www.desmos.com/calculator/86hptwtqwb Websites consulted in research http://mathematicsbhilai.blogspot.com/2015/12/locus-of-mid-point-of-falling-ladder.html http://www.mathematische-basteleien.de/ladder.htm https://www.geogebra.org/m/ZUAcBme2 Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1 Playlist to watch all videos on MindYourDecisions: https://www.youtube.com/playlist?list=UUHnj59g7jezwTy5GeL8EA_g This is the only channel to feature math topics
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Free audio book from Audible: http://www.audible.com/numberphile The book on Amazon: http://amzn.to/1fKe4Yo More links & stuff in full description below ↓↓↓ Author Simon Singh discusses mathematics in the TV show Futurama – specifically taxicab numbers and the great Ramanujan. This video features 1729 and 87539319 among its stars. More from Simon Singh at: About Brady’s mo…
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Featuring Simon Singh – catch him on the latest Numberphile Podcast too… https://youtu.be/kOttzKC33Vk More links & stuff in full description below ↓↓↓ Catch the Numberphile Podcast at: http://bit.ly/Numberphile_Pod_Playlist or at https://www.numberphile.com/podcast/ More videos with Simon on Numberphile: http://bit.ly/SimonSinghPlay Simon has written a book about math in The Simpsons and Futurama… And other books… https://amzn.to/2N05qJn Futurama
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Featuring Neil Sloane… Check out Brilliant (and get 20% off their premium service): https://brilliant.org/numberphile (sponsor) More links & stuff in full description below ↓↓↓ Trapped Knight T-Shirt: https://teespring.com/en-GB/numberphile-trapped-knight Neil Sloane is creator of the On-Line Encyclopedia of Integer Sequences: https://oeis.org For more on the sequences and diagrams in this video, you can start at: https://oeis.org/A316667
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Featuring Professor Carlo Séquin – see more from him at: http://bit.ly/carlosequin More links & stuff in full description below ↓↓↓ More on this topic soon… Animation by Pete McPartlan: http://bit.ly/PeteMcPartlan Support us on Patreon: http://www.patreon.com/numberphile NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Numberphile is supported by the Mathematical Sciences Research
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This is a pretty tricky problem. Can you solve for the angle? Watch the video for the solution. I thank Barry, and I thank Akshay Dhivare from India for suggesting the problem via email. Sources https://gogeometry.blogspot.com/2008/05/elearn-geometry-problem-10.html Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1 Playlist to watch all videos on MindYourDecisions: https://www.youtube.com/playlist?list=UUHnj59g7jezwTy5GeL8EA_g This is the only channel to feature math topics
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Numberphile is also on Facebook: http://www.facebook.com/numberphile More links & stuff in full description below ↓↓↓ 142857 is the most “famous” of the intriguing cyclic numbers. Featuring Dr Tony Padilla from the University of Nottingham – https://twitter.com/DrTonyPadilla NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Patreon: http://www.patreon.com/numberphile Brady’s
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A compilation of Numberphile sound checks – Brady typically asks “what did you have for breakfast” so he can monitor audio levels. More links & stuff in full description below ↓↓↓ Previous sound checks with scientists here: http://youtu.be/4anqDfgQneA Support us on Patreon: http://www.patreon.com/numberphile NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub
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Photomath can’t solve this, and neither can Mathway, Symbolab, or Desmos. Can you? I explain how you can. A similar problem was given to high school students in Massachusetts, and you really have to know what you’re doing to figure it out. Thanks to all patrons! Special thanks this month to: Shrihari Puranik Richard Ohnemus
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This is a really fun geometry problem. It comes from the UKMT, a test which is part of forming the Olympiad team in the UK. Thanks to Liam for sending it to me! Can you figure it out? Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1 Playlist to watch all videos on MindYourDecisions: https://www.youtube.com/playlist?list=UUHnj59g7jezwTy5GeL8EA_g This is the only channel to feature
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George Dantzig, William Sidis, Srinivasa Ramanujan? Who was the real Good Will Hunting? More links & stuff in full description below ↓↓↓ Maths in Good Will Hunting: http://www.youtube.com/watch?v=iW_LkYiuTKE This video features Numberphile’s very own mathematics superstar – Dr James Grime. NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady
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Squarespace: http://www.squarespace.com/numberphile This video features Hannah Fry – https://twitter.com/fryrsquared More links & stuff in full description below ↓↓↓ More on this topic (and lizards): http://youtu.be/Z8lv2vy5vco And even more on this topic: http://youtu.be/ygHwBxWyI6E The paper: http://bit.ly/RPSpaper Reddit for this video: http://redd.it/2tq25k Art and animation by Pete McPartlan Support us on Patreon: http://www.patreon.com/numberphile NUMBERPHILE Website: http://www.numberphile.com/ Numberphile
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Multiplying by lines is a fun way to visually multiply numbers. This is why how you can use it for advanced examples. I wrote about the details in a book: “Multiply Numbers By Drawing Lines” https://www.amazon.com/gp/product/1500866148/ Watch the intro video first: https://www.youtube.com/watch?v=0SZw8jpfAk0 00:25 Numbers different # digits (122×13) 01:12 The digit 9 (19×11) 02:25 Negative
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The famed Poincaré Conjecture – the only Millennium Problem cracked thus far. More links & stuff in full description below ↓↓↓ Ricci Flow (used to solve the problem): http://youtu.be/hwOCqA9Xw6A Riemann Hypothesis: http://youtu.be/d6c6uIyieoo Extra interview footage with Jim Isenberg: http://youtu.be/7eJleW0JcKg Grigori Perelman’s paper: http://bit.ly/perelmanpaper Discussed here by Katie Steckles and James Isenberg. Support us on Patreon:
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More videos with Dr Holly Krieger: http://bit.ly/HollyKrieger More links & stuff in full description below ↓↓↓ Dr Holly Krieger is based at Murray Edwards College, University of Cambridge. Want some chemistry videos? Brady does those too: https://www.youtube.com/periodicvideos More on centrifuge problem via Matt Baker: https://mattbaker.blog/2018/06/25/the-balanced-centrifuge-problem/ Numberphile is supported by the Mathematical Sciences Research Institute (MSRI):
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This is good practice for math Olympiad type problems. I thank Mirza for suggesting the problem, and since I couldn’t figure it out, I also thank Mirza for sending the solution. Can you figure it out? Sources #simple_core_math_exercise#玩玩系列 Gepostet von QED Math Blog am Freitag, 24. August 2018 Quite interesting. I stared at it for a
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