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The Banach–Tarski Paradox

Vsauce | March 13, 2025



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Q: “What’s an anagram of Banach-Tarski?”
A: “Banach-Tarski Banach-Tarski.”

twitter: https://www.twitter.com/tweetsauce
Instagram: http://www.instagram.com/electricpants

Kevin’s Field Day video: https://www.youtube.com/watch?v=1zARMZ08ums

Field Day: https://www.youtube.com/channel/UCRPktNf5vnBR1J4e7t1RUVg

Deep dream animation by http://instagram.com/NaderMakki/

If you like it, you’ll love this video also by Nader: https://www.youtube.com/watch?v=fJ9j_z2kXI0

Chocolate illusion: http://mathandmultimedia.com/2014/07/22/explanation-infinite-chocolate-bars/

Chocolate illusion video: https://www.youtube.com/watch?v=dmBsPgPu0Wc

related Numberphile videos:

sizes of infinity (includes diagonal argument): https://www.youtube.com/watch?v=elvOZm0d4H0
infinity paradoxes: https://www.youtube.com/watch?v=dDl7g_2x74Q

Vi Hart on types of infinity: https://www.youtube.com/watch?v=23I5GS4JiDg
Countable & uncountable definitions:

http://mathinsight.org/definition/uncountable
https://en.wikipedia.org/wiki/Countable_set
https://en.wikipedia.org/wiki/Uncountable_set

Banach-Tarski on wikipedia: https://en.wikipedia.org/wiki/Banach%E2%80%93Tarski_paradox

Banach-Tarski proofs:

http://math.uchicago.edu/~may/REU2014/REUPapers/Robinson.pdf
https://www.math.hmc.edu/~su/papers.dir/banachtarski.pdf
http://people.math.umass.edu/~weston/oldpapers/banach.pdf

Banach-Tarski explinations online:

http://www.irregularwebcomic.net/2339.html
http://www.kuro5hin.org/comments/2003/5/23/134430/275?pid=5#10
http://skepticsplay.blogspot.co.uk/2010/05/doubling-sphere.html
http://austinrochford.com/posts/2014-05-14-banach-tarski-paradox.html
http://www.math.cornell.edu/~mec/Summer2009/Whieldon/Math_Explorers_Club%3A__Lesson_Links/Entries/2009/7/28_Lesson_6%3A__Whats_an_Anagram_of_Banach-Tarski.html
http://rachellevanger.com/index_files/BT%20Animated%20Presentation%20Web.pdf
http://quibb.blogspot.co.uk/2013_03_01_archive.html
http://blog.computationalcomplexity.org/2011/04/what-did-banachs-wife-think-of-banach.html
https://geopolicraticus.wordpress.com/tag/banach-tarski-paradox/
http://dgleahy.com/p47.html
https://www.math.hmc.edu/funfacts/ffiles/30001.1-3-8.shtml

Cayley graph animated gif: https://twitter.com/GIFsofWikipedia/status/624202342259240960

Hilbert’s hotel on wikipedia: https://en.wikipedia.org/wiki/Hilbert%27s_paradox_of_the_Grand_Hotel

types of infinity: http://www.xamuel.com/levels-of-infinity/

set theory and quantum physics: http://link.springer.com/article/10.1007/BF02213427#page-1

LHC gif: http://cms.web.cern.ch/news/lhc-data-be-made-public-open-access-initiative

Zermelo-Fraenkel axioms of mathematics: http://mathworld.wolfram.com/Zermelo-FraenkelAxioms.html

Is math invented or discovered?

http://phys.org/news/2013-09-mathematics-effective-world.html
http://www.scientificamerican.com/article/is-the-universe-made-of-math-excerpt/

more deep dream images: https://www.reddit.com/r/deepdream/

BOOKS:

The Pea and the Sun: http://www.amazon.com/The-Pea-Sun-Mathematical-Paradox/dp/1568813279
The Outer Limits of Reason: http://www.amazon.com/Outer-Limits-Reason-Science-Mathematics/dp/0262019353
Why Beliefs Matter: http://www.amazon.com/Why-Beliefs-Matter-Reflections-Science/dp/0198704992
Things to Make and do in the Fourth Dimension: http://www.amazon.com/Things-Make-Fourth-Dimension-Mathematicians/dp/0374275653

Music by http://www.youtube.com/JakeChudnow and
http://www.audionetwork.com

Written by Vsauce

Comments

This post currently has 48 comments.

  1. @braziliantsar

    March 13, 2025 at 5:40 am

    I guess I kind of got it? Feels like just a purely mathematical paradox, essentially saying "if there's an infinite amount of x that composes y, then rearranging them can lead to multiple copies of y". But since the only countable and uncountable infinities are just our human concepts of space (as in the space that can be occupied in the universe) and points, which have no dimensions nor mass, it can't be applied to the real, physical world. Hopefully I can understand it better one day, because I feel like there's still more to it.

  2. @Carlinios

    March 13, 2025 at 5:40 am

    I have been thinking about infinity and i think i grasped something that may be interesting to ponder, although it may be wrong, but i feel like you can subtract from infinity and end up with less than before, or with a smaller infinity, because if you take out some number in a suposedly infinite set of points in a sphere, you create the need for that set to always be filling itself in the spot that is left over, which is something that it didn't need to do before, you created that constant need by subtracting that countable number, because there is a infinite number of holes to fill aswell, so if you take 2 out, there's 2 holes to fill, 3 would mean 3 to fill and so on in a never ending cycle

  3. @Unkownuser.com.n

    March 13, 2025 at 5:40 am

    But in the rules he told in the colour points you are just keeping the same colour adding to every point on the sphere then why there will be a differenciation and addition from it 😂😂😂😂😂

  4. @md-io4tb

    March 13, 2025 at 5:40 am

    7:34 But what if, after the guest in room number 1 has left, all the others do not move back so that the guest in room nr 2 is not back in room nr 1, and room number 1 stays vacant?

  5. @HeroOfTime2610

    March 13, 2025 at 5:40 am

    Great video, just deposited 2 million pounds in my account from this duplication glitch thanks vsauce! Hopefully the department of work and pensions doesnt come knocking asking questions, they might patch it

  6. @Sara_squatch

    March 13, 2025 at 5:40 am

    Would there be an infinite alphabet of words though? I feel like if A, AA, AAA…went on for infinity, you’d never get to AB…
    It would have to be its own set of infinite letters, and so on through the alphabet. 🧐

  7. @Syclone0044

    March 13, 2025 at 5:40 am

    What an utterly worthless exercise in mental mast**bation. He uses dishonest examples to fool the viewer. Chocolate bars, cash bills, dictionaries and hotels exist in reality. They are defined, we can measure their weight, length, etc. Infinite numbers do not exist in reality. Only the concept of them. There is nowhere that “contains” a list of “all” possible numbers. There is only the simple algorithm used to come up with another number.

    This is exactly like the difference between bitmap graphics on a computer vs vector graphics. Any discussion about the absolute length of a line in a vector graphic is invalid. Only the length relative to the other lengths, and/or some arbitrary initial starting size.

    I’m shocked Vsauce wasted our time with this video when his others are so good. Every idea he discusses in this video is invalid because it relies upon fooling the viewer into thinking infinite numbers are somehow finite. He uses all phony examples, because there are no “real” examples.

    Nobody cares about a wallet that “could” contain unlimited cash in your imagination. It’s not even making a valid statement. It’s nonsense. The idea of “infinite money” is invalid because money itself is a thing whose definition and existence is entirely predicated upon it being finite. Even fiat currency can be counted, there is no cash bill printing press that has printed “infinite” bills. We can count every one. There’s an absolute limit, an upper bounds to the number of bills that could ever conceivably be produced just knowing the volume of the entire Earth containing the raw materials from which they would be produced.

    It’s embarrassing reading all the comments from people utterly bamboozled into thinking some great profound idea has been revealed in this video. I can’t believe anybody even calls this a “theorem” or that someone actually spent time giving it a name. How pointless! I can’t believe “mathematicians” get paid to ponder such stupid bullshit.

  8. @linus.106

    March 13, 2025 at 5:40 am

    Bruh i have an exam tomorrow dont mess with my sanity 😭
    I swear i was understanding everything like until the sphere thing appeared and then un-understood everything 😭

  9. @janjan9874

    March 13, 2025 at 5:40 am

    We think this is theoretically possible scientist believe this is possible dude stop prove it at the end of the day. It’s just a theory big bang is still just theory, so yeah, prove it dude.😂

  10. @fairy_cloudz

    March 13, 2025 at 5:40 am

    Had to come back to this after years
    I fell asleep to this video one time in middle school but dreamed/made up whatever I thought the result of the vid was going to be but never actually went back to it 😭
    So glad I did because this is so interesting

  11. @colinleung-t6c

    March 13, 2025 at 5:40 am

    how is counting natural numbers something that can be done in a finite period of time, but real numbers isn't? we're able to count either, one just comprises of separate infinities between natural numbers. Arguably, there is as much infinity in between 0.1 and 0.2 as there is between 1 and 2. Just as such, can't you say there is as much infinity between 0.00000000001 and 0.00000000002? Like how is one infinity 'countable' and one isn't? Is it because when you go to count an 'uncountable' infinity, you will not be able to start in the first place, because there is infinite space between 0 and the next real number?

    also, with the diagonal theory. say you line up the infinity of whole numbers with the infinity of real numbers between zero and one. you use the diagonal theory to create a new number not yet in the set. And then you count one more number upwards on the whole number set…
    right? isn't the diagonal theory flawed?

    also with the hotel thing… understanding infinity as unexpanding. If infinity is a concept described as akin to a number such as seventeen or one billion (each of these two being unexpanding), then infinity is also logically unexpanding. While this term is impossible to understand, and paradoxical, we can somewhat work with this logic. With an infinite number of rooms, all being occupied, we assume that this unexpanding concept or 'number', as one often thinks of it, of rooms has one corresponding guest. Now along with this, if we think of infinity as definite, as something that if manipulated will no longer be the same (like how when you do 17-1, the answer is 16, not 17), we realize the flaw in this logic that you could fit another person into the hotel. By working on the assumption that you can add or subtract (or otherwise manipulate) a theoretically pure 'infinite' set, and that you will be left with something indiscernable from the original, you in turn are treating the infinite set as finite; manipulable. This logic can also be applied to a situation when a guest leaves the hotel. Because you are treating infinity as a finite manipulable set, then there will logically be one room vacant. So I think this hotel problem is based off of conflicting definitions. There is infinity as infinity, and infinity as an infinitely large finite set. I believe those two have a difference.

    The concept of infinity is inherently impossible to define or quantify, because to define or quantify infinity is paradox to what infinity is. Infinity is like a word in a language that has no direct translation into another language. Infinity belongs to the language of the unexperiencable, and the aspects of existence that humans interact with and were designed to exist in, are of the language of the experiencable (I thought of saying language of theory, and language of reality, but theory is indistinguishable from reality)

    So this video treats the concept of infinity under the definition of an infinitely vast finite set. Another comment, when you begin an attempt in understanding the impossible, you see the same thing. Almost like in quantum superposition and other things. When you go so small, or so big, things no longer exist. because to exist (to us humans) is to be static for a finite time period. an orange exists because you hold it and you can see it for one second, two seconds. One believes an orange exists that they see in someone else's car while passing, and the orange that was seen in a television is believed to have existed. In quantum superposition (I'm not that informed on it) a photon or electron appears to a human as existing twice, or more than twice, hence not existing at all. This idea of something 'being' in multiple locations in space during one finite moment of time, humans conclude that this object is transcendent. But maybe, these things do exist. Using the definition of existence as being 'static' for a finite period of time, and stretching this to our knowledge of infinity as being non-experiencable or understandable, we can reconcile these photons and electrons. we may say that this photon does indeed exist, and is static in one place for an immeasurable amount of time, 'infinitely' small. In the same way that once you manipulate an infinite set, thereby treating it as an infinitely large finite set, you 'ruin' things that are so small. For example, the 'observer effect', seems to affect the state of the observed through the act of observation, because by observing a set (as humans observe things and process them within perceptibly finite amounts of time), one is destroying the 'sanctity' of this infinite 'entity' or existence. Some things can only exist by not existing.

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