TREE(3) (extra footage) - Numberphile

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  • Опубликовано: 14 июн 2024
  • Main video: • The Enormous TREE(3) -...
    Featuring Professor Tony Padilla.
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Комментарии • 2,7 тыс.

  • @gdsfish3214
    @gdsfish3214 6 лет назад +6341

    Don't you hate when you're trying to prove how big TREE(3) is with finite arithmetic, but then the universe resets itself.

    • @ruben307
      @ruben307 6 лет назад +128

      reminds me of Hitchhikers guide to the galaxy. The answer is easy yes it is finite the proof is very long.

    • @0menge
      @0menge 6 лет назад +43

      I totally hate it!

    • @guillaumelagueyte1019
      @guillaumelagueyte1019 6 лет назад +144

      I was so close last time I tried. Oh well, maybe this time I'll have better luck

    • @mrJety89
      @mrJety89 6 лет назад +157

      That happened to me Tree(3) times already.

    • @DaniErik
      @DaniErik 6 лет назад +152

      "I have discovered a truly marvelous proof of this, which this margin is too narrow to contain."

  • @RBuckminsterFuller
    @RBuckminsterFuller 6 лет назад +4714

    "This IQ test stumps most mathematicians! Finish the sequence 1, 3, ..."

    • @vampyricon7026
      @vampyricon7026 6 лет назад +199

      I was just thinking about trolling my friends with 1,3...

    • @whatisthis2809
      @whatisthis2809 6 лет назад +124

      RBuckminsterFuller many answer 5 or 9 or 11 or 18 or 29 or 78 or 722 or even asceding so >3

    • @fossilfighters101
      @fossilfighters101 6 лет назад +9

      +

    • @ghyrt1
      @ghyrt1 6 лет назад +151

      According to the Online Encyclopedia of Integer Sequences, 4 is an acceptable answer

    • @pieffe8
      @pieffe8 6 лет назад +25

      In the sequence is infinite you can't finish it...

  • @jongalonja9233
    @jongalonja9233 4 года назад +1629

    Well now I want to know if TREE(3) is prime

    • @priyansh1210
      @priyansh1210 4 года назад +295

      You can assume it's prime for now since it doesn't have any known non trivial divisors :P

    • @HerrKeuner1948
      @HerrKeuner1948 4 года назад +193

      @@priyansh1210 That's a dangerous assumption ;)

    • @nothisispatrick6832
      @nothisispatrick6832 4 года назад +42

      wonder if its possible to calculate that probability

    • @number_8903
      @number_8903 3 года назад +167

      First try to prove that tree(3) is odd

    • @chebichevinovichskic
      @chebichevinovichskic 3 года назад +44

      The guy said the closest you can get to knowing anything abt the number is the number of signs needed to prove it s finite...

  • @whyit487
    @whyit487 4 года назад +2055

    The class: Tree(1)
    The homework: Tree(2)
    The exam: Tree(3)

    • @Aerialyn
      @Aerialyn 4 года назад +126

      The test: tree(3)
      The finals: tree(tree (3))

    • @playmaker4700
      @playmaker4700 4 года назад +16

      TREE(Infinity)

    • @keafoleafo8368
      @keafoleafo8368 3 года назад +44

      @@playmaker4700 Isn't that just infinity anyway?

    • @tinybro5630
      @tinybro5630 3 года назад +19

      The Job Interview: Tree(Tree(Tree...(3)))))))))...

    • @tlep2979
      @tlep2979 3 года назад +11

      @@keafoleafo8368 yes, any size of infinity (say omega) put into TREE should return infinity. I don't know if it would return the same size of infinity or not though

  • @heliocentric1756
    @heliocentric1756 6 лет назад +3671

    "I've discovered a remarkable proof of Tree(3) theorem but the universe is too small to contain it"

    • @fossilfighters101
      @fossilfighters101 6 лет назад +54

      +

    • @fibbooo1123
      @fibbooo1123 6 лет назад +41

      +

    • @romajimamulo
      @romajimamulo 6 лет назад +80

      fossilfighters101 "also my brain is too small to contain it"

    • @me_too_thanks5062
      @me_too_thanks5062 6 лет назад +115

      What a shame we don't live in a quality universe that could fit tree(3)

    • @ashkara8652
      @ashkara8652 6 лет назад +60

      Only acceptable place to actually use that excuse

  • @alanturingtesla
    @alanturingtesla 6 лет назад +1472

    In base TREE(3) it is 10.

    • @zoranhacker
      @zoranhacker 6 лет назад +6

      A odgovor na prvo pitanje?

    • @subhransu75
      @subhransu75 6 лет назад +322

      And in binary the first digit is 1.

    • @vp_arth
      @vp_arth 6 лет назад +18

      Can you give us their alphabet here?

    • @joonatanlinkola9059
      @joonatanlinkola9059 6 лет назад +114

      What a useful base that is

    • @DuskKaiser
      @DuskKaiser 6 лет назад +1

      Subhransu Mohapatra not necessarily

  • @stevekim9662
    @stevekim9662 4 года назад +718

    What they teach you in class: Tree(3)
    What they ask you in the exam: Tree(Tree3)

    • @SystemOfATool
      @SystemOfATool 4 года назад +36

      What they teach you in class: 1 & 3
      What they ask you in the exam: Tree3

    • @sirdonki8085
      @sirdonki8085 4 года назад

      😨😨😱😱😭😭😭😭

    • @MrTheKamir
      @MrTheKamir 4 года назад +17

      My brain just collapsed Tree(3) times

    • @barsozuguler4744
      @barsozuguler4744 4 года назад +2

      Im scared this like 11!!!!!!!!!!!!!!!!!!

    • @pbj4184
      @pbj4184 4 года назад +1

      @@SystemOfATool
      Class: 33
      Exam: Tree(3)

  • @NoriMori1992
    @NoriMori1992 5 лет назад +1113

    "The universe will eventually reset itself."
    "The universe will eventually reset itself."

    • @myownmeadow1320
      @myownmeadow1320 4 года назад +18

      Once comes around what do you feel, I love Jack woke up press and seal me big pain to Pono.
      (speech to text, Not what I meant but too funny to not post)

    • @bigbluetrex__8475
      @bigbluetrex__8475 4 года назад +22

      "The universe will eventually reset itself assuming that that will happen forever and that the universe is a perpetual machine, otherwise eventually everything will end forever and space time will cease to exist."
      What a happy thought to think about while you're alone in the house!

    • @mathmachine4266
      @mathmachine4266 4 года назад +7

      Looks like we had less time than we thought

    • @HimanXK
      @HimanXK 4 года назад +19

      Repetition legitimizes
      Repetition legitimizes

    • @uncoolloser6233
      @uncoolloser6233 3 года назад +4

      11 11 It’s impossible to prove or disprove that it will. We can only make more and more assumptions.
      Edit: or we can just accept one theory, which is fine, as none of us will ever live long enough to find out the validity of said theory.

  • @kcthewanderer
    @kcthewanderer 6 лет назад +2350

    We're gonna need a bigger universe.

    • @user-ft4pb5vb3e
      @user-ft4pb5vb3e 6 лет назад +39

      If you were to increase the universe's size by a googolplex factorial ^^^^^ a googolplex factorial-fold, then tried to fit TREE(3) cubic Planck lengths in there...you couldn't do it.

    • @ongbonga9025
      @ongbonga9025 6 лет назад +18

      I reckon we'll need exactly a Graham's Number of universes to write down Tree (3), assuming one digit per Planck unit. Call it intuition.

    • @MikeRosoftJH
      @MikeRosoftJH 6 лет назад +12

      No, you aren't anywhere close.

    • @CaseyShontz
      @CaseyShontz 5 лет назад +16

      kcthewanderer I’ll go to Costco and buy one, be back in tree(3) minutes

    • @justsayapple1381
      @justsayapple1381 5 лет назад +3

      jawad mansoor I’ll have to remember to order one next time the universe resets

  • @PallyNut
    @PallyNut 6 лет назад +2005

    If numberphile has Pi as their picture.. Numberphile2 should have Tau as their picture.

    • @CaseyShontz
      @CaseyShontz 5 лет назад +28

      PallyNut you right, you right

    • @alephnull4044
      @alephnull4044 5 лет назад +8

      Yes!!

    • @arvasukulkarni3686
      @arvasukulkarni3686 5 лет назад +14

      This needs more likes

    • @leondost3575
      @leondost3575 4 года назад +2

      tau rules, change my mind!
      also, this needs way more likes :)

    • @qiki_info
      @qiki_info 4 года назад +20

      NumberphileTREE(3) for SERIOUS insiders.

  • @darkshoalproductions
    @darkshoalproductions 5 лет назад +360

    Well, at least we know that the entire universe is not just a simulation being run to calculate TREE(3) then.

    • @tb-cg6vd
      @tb-cg6vd 4 года назад +28

      Brilliant. My sense of free will is now secure!

    • @SledgerFromTDS.
      @SledgerFromTDS. 2 года назад +1

      @@tb-cg6vd Brilliant to See your Comment, But there is another Video here

    • @SledgerFromTDS.
      @SledgerFromTDS. 2 года назад

      Brome to See your Comment, But there is another Video here

    • @albert6157
      @albert6157 Год назад

      @@tb-cg6vd keep in mind, its a "sense" of free will. Not free will itself ;)

    • @izayus11
      @izayus11 Год назад +1

      Actually , it is. We are just the bootloader.

  • @massimodelbianco442
    @massimodelbianco442 5 лет назад +832

    And still, TREE(3) Is closer to 0 than infinity.

    • @caduaraujo331
      @caduaraujo331 4 года назад +57

      so is every cardinal

    • @Bogdanko93
      @Bogdanko93 4 года назад +88

      @@SoloLevellor except my ego

    • @siddhantnagrath8144
      @siddhantnagrath8144 4 года назад +3

      Massimo Del Bianco depends on which infinity

    • @siddhantnagrath8144
      @siddhantnagrath8144 4 года назад +2

      It’s faster than a function of Epsilon sub script zero

    • @Shadowwolf-1337
      @Shadowwolf-1337 4 года назад +6

      Infinity divided by 3 would be closer to zero than infinity. Well, it would also be infinity. Wait, what?!

  • @felixp535
    @felixp535 6 лет назад +1438

    You know what's even crazier?
    TREE(3)^0 = 1

    • @criskity
      @criskity 6 лет назад +365

      And 1/TREE(3) is really small.

    • @djhokage1
      @djhokage1 6 лет назад +199

      Yeaaa, the real deal still is Zero, the number which demolishes everything else.

    • @jackreacher6240
      @jackreacher6240 6 лет назад +119

      well ..... -2 is smaller.

    • @petritdauti6258
      @petritdauti6258 6 лет назад +105

      Félix Pinchon
      TREE( TREE(TREE(TREE(3))) )^0=1 too
      Wtf universe

    • @skeletonrowdie1768
      @skeletonrowdie1768 5 лет назад +71

      ah so the zeroth root of 1 is TREE(3)! We found the solution boys!

  • @aza3262
    @aza3262 6 лет назад +574

    Don't you hate it when you're doing proof for your maths homework and the universe just resets itself....

  • @RobertSzasz
    @RobertSzasz 5 лет назад +127

    1,3, Visible universe collapses into a singularity

  • @gilbertoortega3274
    @gilbertoortega3274 4 года назад +126

    When he wrote Tree (Tree(3)) I got anxious because I thought the universe was going to crash.

  • @emilioherrera6345
    @emilioherrera6345 6 лет назад +877

    Totally dissapointed, this video should’ve been called “(extra foliage)”

  • @AJ-tr4jx
    @AJ-tr4jx 6 лет назад +865

    the universe will eventually reset itself, the universe will eventually reset itself.
    hah! well played

    • @BoWeava
      @BoWeava 6 лет назад +8

      A J
      Lol I scrolled down hoping someone else saw that haha

    • @carbrickscity
      @carbrickscity 6 лет назад +6

      BoWeava They did the same on the poincare recurrence time vid

    • @livedandletdie
      @livedandletdie 6 лет назад

      yes due to there only being a finite amount of states that the universe can be in. Even if some of the states are infinitely big.

    • @BoWeava
      @BoWeava 6 лет назад

      CarBricksCity niiice, haven't seen that one

    • @Bodyknock
      @Bodyknock 6 лет назад +3

      The thing I don’t quite get about poincare recurrence for the universe is that the recurrence theorem requires a sequence of sets that is bounded. For instance, gas molecules in a closed box is a bounded system and a sequence of states of those molecules within that box will repeat themselves according to the theorem. But the universe is expanded and therefore the system is unbounded so I’m not quite clear on why the Poincare recurrence theorem applies. To take the gas in a box analogy further, if the box is instead an inflating balloon and the balloon can inflate indefinitely then there is no guarantee the molecules will repeat states because they have paths available which can expand outward with their boundary. Similarly the particles in the universe can expand with the universe so it seems like there would be no guarantee their states would repeat (since part of their states includes their relative positions in an expanding spacetime.)
      I’m not saying the video is wrong, I’m just confused how this is resolved for an expanding boundary.

  • @avi8aviate
    @avi8aviate 5 лет назад +164

    That TREE(3) will be great for getting LOG(3)s!

    • @harryw4802
      @harryw4802 3 года назад +2

      bruh lol

    • @harryw4802
      @harryw4802 3 года назад +3

      also log(3) ¬ 0.477121

    • @moodleblitz
      @moodleblitz 3 года назад +3

      clever

    • @georgesmyrnis1742
      @georgesmyrnis1742 4 месяца назад +1

      Lol. The question is how many LOG(3)s does a TREE(3) give? You will need multiple axes to figure that one out.

    • @avi8aviate
      @avi8aviate 4 месяца назад +1

      @@georgesmyrnis1742 Likely millions of axes, if not even more than that.

  • @astroash
    @astroash 5 месяцев назад +4

    It is a tradition for me to come back to Graham's number and TREE(3) every once couple of years.

  • @dkranda
    @dkranda 6 лет назад +342

    But is it prime?

    • @vampyricon7026
      @vampyricon7026 6 лет назад +1

      same question

    • @guillaumelagueyte1019
      @guillaumelagueyte1019 6 лет назад +19

      Maybe there's a way to prove whether it's odd or even.

    • @connorking984
      @connorking984 6 лет назад +18

      Dan Kranda almost definitely not, every time you go up and find a prime while trying to divide to see if it's prime, you add that number to you're division pool. Since tree(3) is sooo big you have so.... Many primes to divide by its almost definitely not prime. plus half of all numbers are instantly taken out by dividing by two.

    • @sage5296
      @sage5296 6 лет назад +36

      Well the frequency of primes is like 1/ln(x) so I'd give it a 1/ln(TREE(3)) chance of being prime... aka 0

    • @michaeljupille1076
      @michaeljupille1076 6 лет назад +21

      Well TREE(1) and TREE(2) are prime so it isn't unthinkable, but I'm gonna go out on a LIMB and say that it would be tricky to definitively prove either way
      edit:
      before I get called out, I totally forgot 1 isn't prime, but I couldn't resist the pun

  • @Yebjic
    @Yebjic 6 лет назад +746

    Well, TREE(3) is clearly smaller than the sum of all natural numbers, therefore, an the upper bound of TREE(3) is -1/12

    • @migfrarummet1907
      @migfrarummet1907 6 лет назад +45

      bivtyfrcygvubugwerdcfuvgibjhvibobhjhb!
      I can't take this!

    • @petritdauti6258
      @petritdauti6258 6 лет назад +9

      Yebjic
      Yeah thats something i dont get about infinity too

    • @jannegrey593
      @jannegrey593 5 лет назад +38

      Only in Riemann Zeta function. Watch Mathologer video for full explanation. The one done in response to Numberphile video on -1/12.

    • @maxhaibara8828
      @maxhaibara8828 5 лет назад +73

      We do have the upper bound for TREE(3)
      It is clearly less than TREE(3)+1

    • @whatno5090
      @whatno5090 5 лет назад +16

      @@vishalarya93 yes, welcome to the joke

  • @L0j1k
    @L0j1k 4 года назад +60

    "So it's never been done before?"
    "Whoa-whoa-whoa-whoa there guy. Just hold your horses. The question is CAN it be done?"
    LOL

  • @zemc77
    @zemc77 6 лет назад +23

    "Exponentiation on steroids" Best description of Arrow notation I ever heard.

  • @balazslovenberg
    @balazslovenberg 6 лет назад +221

    Surely TREE(n) grows faster than LOG(n)

    • @romajimamulo
      @romajimamulo 6 лет назад +6

      Balazs Lovenberg it sure does

    • @ImMataza
      @ImMataza 6 лет назад +6

      Man that's an amazing comment , I wish I thought of it :)

    • @chimkelvin5705
      @chimkelvin5705 6 лет назад +23

      You should also consider ROOT(n), because it grows slower than TREE(n) too.

    • @GlobalWarmingSkeptic
      @GlobalWarmingSkeptic 6 лет назад +2

      Hard to tell but yes I think if we examine the growth the TREE function just edges it out.

    • @suyashshandilya9891
      @suyashshandilya9891 5 лет назад +4

      I once heard of an infinite divergent sequence but later it got summed up to -1/12. You never know man. You. Never. Know...…...

  • @phampton6781
    @phampton6781 6 лет назад +55

    "The universe is too small to contain it." I'll use this excuse next time I haven't done a due essay.

  • @huwman
    @huwman Год назад +56

    I came across TREE (3) yesterday when I was watching an online documentary and it both blew my mind and excited me immensely. I'm not a mathematician, I'm a musician, but this is just so awesome. I love this guy's brains and enthusiasm. Anyway, we were looking for a name for our new band - so calling it TREE (3). I hope no-one else has that name, but I love this so much. Thanks! :)

    • @masonicmoth
      @masonicmoth Год назад +5

      I would name a band 6EQUJ5 and pronounce it "The WOW Signal" lol

    • @IsaacHarvison-mt5xt
      @IsaacHarvison-mt5xt 9 месяцев назад +1

      I'm smart guy math what's the point I understand to try understand Googleplex the numbers so unimaginable at its but so what's the point Graham the numbers so unimaginable what's the poin going beyond t 😂😂

    • @bizw
      @bizw 7 месяцев назад

      ​@@IsaacHarvison-mt5xtwhat

  • @jimgeary
    @jimgeary 5 лет назад +25

    When he started nesting the Tree()’s, my nethers clenched fearing the universe might rend.

  • @Skippy3rd
    @Skippy3rd 6 лет назад +638

    Is TREE(3) closer to TREE(2) or TREE(4)? Do we know anything about the growth characteristics of the TREE() function?

    • @vampyricon7026
      @vampyricon7026 6 лет назад +33

      +

    • @HopUpOutDaBed
      @HopUpOutDaBed 6 лет назад +472

      TREE(n) is always going to be closer to TREE(n-1) than TREE(n+1) in terms of absolute size. considering TREE(4) is just TREE(3) + an extra seed , you could just write out TREE(3) and then repeat entire structures only changing the color of one seed, effectively nearly doubling the size. And that's just changing the color of the seeds using 3-seed structures already constructed, not counting all the entirely new trees you could make using all 4-seeds

    • @norielsylvire4097
      @norielsylvire4097 6 лет назад +145

      Scot Brown TREE (3) is way closer to -TREE (3) than to TREE (4)

    • @vampyricon7026
      @vampyricon7026 6 лет назад +57

      HopUpOutDaBed Why nearly doubling? I think, without consider the 4-colour trees, you'd already get 4(TREE(3)). Using RGBW, you could do a TREE(3) with RGB, RGW, RBW, and GBW each.

    • @Nixitur
      @Nixitur 6 лет назад +44

      +HopUpOutDaBed - I like the way you think, that's a very elegant proof!

  • @claudiuacsinte4757
    @claudiuacsinte4757 6 лет назад +402

    "Exponantiation on steroids"

    • @Anaklusmos42
      @Anaklusmos42 6 лет назад +2

      scalpian your thing, to the power of TREE(TREE(TREE(3)))

    • @andymcl92
      @andymcl92 6 лет назад +11

      ExponenTREEation!

    • @y__h
      @y__h 6 лет назад +1

      Symbol juggling on meths.

    • @JorgetePanete
      @JorgetePanete 6 лет назад

      Claudio Acsinte Exponentiation*

  • @ineedtoeatcake
    @ineedtoeatcake 4 года назад +44

    I love how happy he was at the end describing his joy over this type of math.

  • @tyleralmquist7606
    @tyleralmquist7606 4 года назад +131

    Spongebob: you know what’s -bigger- than tree(3)?
    Patrick: what?
    Spongebob: Tree(4)

    • @thunderstrom878
      @thunderstrom878 3 года назад +3

      And you know what function is faster and larger than TREE ? Subcubic Graph and Busy Beaver 😂

  • @VigoHornblower
    @VigoHornblower 6 лет назад +522

    What if you filled the universe with mathematicians the size of a plank length and then they split up the work?

    • @mattsmith457
      @mattsmith457 6 лет назад +160

      Probably my favorite part about 2017 was this comment because I just imagine a world of tiny scientists talking about numbers perpetually in the multiverse somewhere and that keeps me optimistic about life. I also would love to see what would happen if someone figured it out and the news spread across the trillions of tiny scientists like a wave of celebration as the universe rejoiced in finding the answer. Would it cease to exist since it's purpose would be fulfilled? Would the scientists find another problem to work on? Perhaps they would colonize different universes or even just their own ones and delegate the lesser scientists to act as the land masses. Neat.

    • @jaysephisdeadpool8813
      @jaysephisdeadpool8813 5 лет назад +38

      yeah they not gonna get nowhere

    • @axelpeneau2288
      @axelpeneau2288 5 лет назад +5

      Won't work either

    • @altrag
      @altrag 4 года назад +24

      @@axelpeneau2288 Yep.. Anything we can (reasonably) write as x*10^y notation won't even begin to tickle the things that require the double up-arrow notation, no matter how big y gets.

    • @rodwayworkor9202
      @rodwayworkor9202 4 года назад +2

      Where would they add the symbol?

  • @glendrake9268
    @glendrake9268 6 лет назад +87

    It gives me a new appreciation of infinity.

    • @qiki_info
      @qiki_info 4 года назад +6

      But you're still not even close. lol

  • @Anklejbiter
    @Anklejbiter 5 лет назад +113

    Oh, the universe reset itself again.
    Man, I hate it when that happens.

    • @aasyjepale5210
      @aasyjepale5210 4 года назад +1

      no need to repeat, we can see itno need to repeat, we can see it

    • @Anklejbiter
      @Anklejbiter 4 года назад

      @@aasyjepale5210 haha, haha.

  • @joanalbertmirallespascual3606
    @joanalbertmirallespascual3606 5 лет назад +19

    2:31 "you might remember what this arrow notation is... exponentiation on steroids" lol

  • @batbawls
    @batbawls 6 лет назад +125

    This should've been included in the original video!

    • @numberphile2
      @numberphile2  6 лет назад +52

      I know a true believer like you would watch, but if you post a 19-minute video to RUclips you may as well hang a big sign on it saying "DON'T WATCH THIS"
      Better to post a video on the essentials, then a second video for people who want to go deep?

    • @N0Xa880iUL
      @N0Xa880iUL 6 лет назад +5

      Numberphile2 why not a 3rd? Or maybe 4th! I surely won't mind :)

    • @franklinruan3807
      @franklinruan3807 6 лет назад +21

      Numberphile tree (3)

    • @vampyricon7026
      @vampyricon7026 6 лет назад +4

      You could have at least posted the pre-emptive TREE(TREE(3))

    • @Tahgtahv
      @Tahgtahv 6 лет назад +1

      Thanks for mentioning the bell. Was wondering why I wasn't being notified. That said, what's the point of a subscription if not to notify you of new videos?

  • @zaephou2843
    @zaephou2843 6 лет назад +55

    10:30 There's one contender to the TREE function that can absolutely batter it - SCG (Simple Subcubic Graphs). The problem is that I can't even begin to understand how and why that number is so big, so I guess my video request would be one on SCG.

    • @kannarzoltan7006
      @kannarzoltan7006 6 лет назад +7

      Big FOOT

    • @zaephou2843
      @zaephou2843 6 лет назад +6

      Utter Oblivion is bigger. Although I suppose you could just mention Cantor's idea of absolute infinity to end any big number discussion there and then.

    • @sage5296
      @sage5296 6 лет назад +2

      Zaephou what would be far more interesting would be like if you found another number that was like less than TREE(3) orders of magnitude from TREE(3), like if it was actually coincidentally closeish

  • @swagswag6286
    @swagswag6286 4 года назад +37

    Thanks to this channel I have fallen in love with math and I am really considering studying maths!

  • @IndieSamurai101
    @IndieSamurai101 4 года назад +24

    And 2yrs later, TREE(Graham's number) has been discussed
    That escalated quickly

    • @redvine1105
      @redvine1105 4 года назад +2

      Soumyadeep Bhattacherjee well to be fair this video already goes way beyond that by talking about diagonalized recursive trees

    • @abombata
      @abombata 4 года назад +2

      TREE(Gaham's number) is less than TREE(TREE(3))

    • @isaacwebb7918
      @isaacwebb7918 4 года назад +1

      @@abombata If we assume the function grows with the input, and never drops (easy to prove) then your statement follows naturally from knowing that g(64) < TREE(3), so TREE(n) will be larger for the larger input.
      And TREE(TREE(TREE(TREE(TREE(TREE(...TREE(3))))))) still doesn't match SSCG(3), even if you nest it TREE(3) layers deep.

  • @somethingsinlife5600
    @somethingsinlife5600 6 лет назад +79

    And This is why mathematicians have more fun :)
    They're just not bounded by the physical reality :)

  • @fireeye1386
    @fireeye1386 6 лет назад +56

    I have discovered a truly remarkable proof that tree(3) is finite, which this universe is too small to contain...

    • @Craccpot
      @Craccpot 6 лет назад +4

      fire eye exact words from Fermat if he is still alive today

    • @theviniso
      @theviniso 6 лет назад

      lol

    • @NoobOfLore
      @NoobOfLore 5 лет назад +2

      You have a weird concept of "discovering" something that categorically cannot be contained by your brain.

  • @canatronYT
    @canatronYT 6 лет назад +13

    They used the same editing joke about the poincare repeat conjecture twice!
    They used the same editing joke about the poincare repeat conjecture twice!

  • @MrGrumbleguts
    @MrGrumbleguts 5 лет назад +91

    "The universe resets itself - This is a disaster." Literally that is what disaster means, the disappearance of stars.

    • @MitruMesre
      @MitruMesre 3 года назад +3

      "dis" in disaster refers to unluckiness, not disappearance.

  • @tangyspy
    @tangyspy 6 лет назад +300

    Have been waiting for this number since over a year

    • @frizider2
      @frizider2 6 лет назад +14

      I've been waiting for it since the original graham's number video. When that video was uploaded i was hooked into big numbers and started checking all kinds of different bigger than graham's number numbers. Soon I met the king of them all tree(3) and have been waiting since for numberphile to do a video about it. I wonder if there are any bigger numbers that have been used in math (so obviously not arbitrary ones like tree(3) * 2)

    • @ABc-sv8mv
      @ABc-sv8mv 6 лет назад

      hey ash

    • @amiss8828
      @amiss8828 6 лет назад +6

      could you say you've been waiting for this number since over T(3) years?

    • @Sakkura1
      @Sakkura1 6 лет назад +1

      @frizider2 look up SSCG(3), or even worse SCG(3).

    • @carbrickscity
      @carbrickscity 6 лет назад +2

      SCG(13)

  • @Markovisch
    @Markovisch 6 лет назад +190

    Matt Parker should estimate TREE(3)

    • @kannarzoltan7006
      @kannarzoltan7006 6 лет назад +7

      Markovisch He could, but he doesn't bother doing it.

    • @vampyricon7026
      @vampyricon7026 6 лет назад +7

      At least he tried XD

    • @skepticmoderate5790
      @skepticmoderate5790 6 лет назад +39

      It would be like a kid estimating the number of stars in the night sky.
      "How many stars do you think there are?"
      "Ten."

    • @TheGeneralThings
      @TheGeneralThings 6 лет назад +66

      His answer would be a Parker Tree.

    • @vampyricon7026
      @vampyricon7026 6 лет назад +40

      PARKER(3)=10

  • @willk7184
    @willk7184 4 года назад +28

    I watched both these videos, but I'm still curious HOW they know it's such a huge number.

    • @SomeGuy-ty7kr
      @SomeGuy-ty7kr 2 года назад +10

      given that I'm pretty sure the answer to that was someones dissertation, I'm not sure it would comfortably fit into a youtube video, lol

  • @Splandrocity
    @Splandrocity 10 месяцев назад +4

    Love the excitement of Tony while educating here, these massive numbers are just jaw-dropping from the explanation alone.

  • @pixlark4287
    @pixlark4287 6 лет назад +50

    FYI: It's spelled KRUSKAL'S if you're interested in looking into it.

  • @simoncarlile5190
    @simoncarlile5190 6 лет назад +91

    I'm curious if the size of Tree(n) increases with any kind of regularity as n gets larger. Like if you had an ungodly Cartesian graph where x = n and y = Tree(n), would there be some sort of recognizable pattern in, say, the first 100 y-values? Or does something crazy happen like Tree(57) isn't as large as it "should" be based on all the previous Trees?
    I really want to know more about the growth of the Tree function. I don't really know how much progress has been made (or can be made) in analyzing it this way. After all, Tree(3) doesn't have an upper bound (aside from definitely being finite).

    • @geelzwarteaardbij
      @geelzwarteaardbij 3 года назад +10

      That is really interesting to think off, just like a logarithmic scale we need one for googological numbers like Graham's number and TREE(3) to visualize just how much bigger these numbers are!

    • @efulmer8675
      @efulmer8675 3 года назад +11

      Given that the TREE() function has a similar kind of rule set to the permutations of those objects (I am not a mathematician, mathematicians would probably strike me down for saying such a thing), then given that analogy they would probably do something similar in a way as each TREE(n) theoretically would 'contain' the lower TREE() sets within them plus all of the possible permutations of those sets with that extra seed color.
      I wonder if this has anything to do with Group theory as I just realized I'm starting to pose a similar sort of question...

    • @antonhengst8667
      @antonhengst8667 2 года назад

      Sounds like you're asking if TREE is monotonic

  • @64lundyco
    @64lundyco 5 лет назад +16

    Love the universe resetting itself editing joke

  • @snajper9111
    @snajper9111 2 года назад +15

    Absolutely love this topic. I’ve watch this episode about x20 times over the last year and I smile every time.
    Great work guys

  • @Zejgar
    @Zejgar 6 лет назад +97

    I expected you to use FOREST(n,m) instead of TREEm(n)!

  • @MagnusSkiptonLLC
    @MagnusSkiptonLLC 6 лет назад +249

    I know that the first digit of Tree(3) is 1
    in binary

    • @coolguy4989
      @coolguy4989 6 лет назад +54

      Skippy the Magnificent and in base TREE(3) the first digit is also a 1

    • @eliorahg
      @eliorahg 5 лет назад +18

      Wow. Just now I realized that first digit of every number in binary is 1.
      Like this is obvious but I never thought about it, thus only now I realized it.

    • @user-me7hx8zf9y
      @user-me7hx8zf9y 4 года назад +3

      @@coolguy4989 underrated comment

    • @lunox8417
      @lunox8417 4 года назад +1

      @@eliorahg explain 2

    • @PattyManatty
      @PattyManatty 4 года назад +1

      @@lunox8417 2 is "10" in binary.

  • @vepiru5734
    @vepiru5734 Год назад +2

    Mathematics really feel like magic. By playing a simple game on a piece of paper, you can actually write a concept that is bigger than existence itself. This is mindblowingly elegant.

  • @nutmegninja23
    @nutmegninja23 4 года назад +3

    I wasn’t paying too much attention bc this was background noise to me kinda, but if TREE(3) is 2^^1000, the last digit is a 6. Assuming I’m doing this correctly, 2^^1000 = 4*2^^999 = 16*2^^998, etc. since 16 ends in a “6”, and any number ending with a “6” squared results in a number ending in a ”6”, BOOM! You have one of the digits you need. Progress has been made.

    • @TheSmegPod
      @TheSmegPod 2 года назад +2

      2^^1000 isn't tree3, that's the number of symbols it would take to write down a perfect proof that tree3 is finite

  • @Froggeh92
    @Froggeh92 6 лет назад +72

    Shouldve gotten Prof Moriarty to do it so he can say "Tree Tree" over and over again.

  • @blackkittyfreak
    @blackkittyfreak 6 лет назад +9

    When he started trying to top TREE(3), I almost had a panic attack.

  • @timo4258
    @timo4258 5 лет назад +16

    How about TREE(TREE(3))?
    EDIT: damit, already done in video

  • @oliverbrankodignum2817
    @oliverbrankodignum2817 6 лет назад +1

    His neck tendon pops out while he talks. These guys are so beautifully passionate.

  • @axelitoxer
    @axelitoxer 6 лет назад +9

    4:22 "the universe will eventually reset itself" "reset itself"

  • @AzazeoAinamart
    @AzazeoAinamart 6 лет назад +6

    I literally hear GNASHING OF BOLTS HOLDING EDGES OF THE UNIVERSE when he started making TREE of TREEs

  • @TIO540S1
    @TIO540S1 5 лет назад +6

    You touched on the thing that fascinates me the most. Staying strictly with finite numbers, it's still the case that, no matter how you define a large number - TREE, iterated TREE, busy beaver, whatever, almost every number is larger than the number you've defined. Thinking of that fills me with wonder.

    • @Amethyst_Friend
      @Amethyst_Friend 2 года назад +1

      In fact proportionally, EVERY number is bigger

    • @TIO540S1
      @TIO540S1 2 года назад +3

      @@Amethyst_Friend Yes. If you select a random positive finite integer (yes, the concept of a "random integer" is problematic, but you know what I mean!), the probability of that integer being smaller than any defined integer (Rayo's number, whatever) is 0.

  • @pcajanandanjali
    @pcajanandanjali 6 лет назад +5

    "Universe resets before you can complete the proof" Awww....There goes my plans for the weekend..

  • @jtveg
    @jtveg 6 лет назад +26

    4:23 There was a glitch in the matrix.

    • @davecrupel2817
      @davecrupel2817 6 лет назад +4

      John Thimakis It happens when they change something.....

    • @namewarvergeben
      @namewarvergeben 6 лет назад +9

      That was the universe resetting itself

    • @sage5296
      @sage5296 6 лет назад +1

      Wait a glitch in the matrix? glitch in the matrix?

    • @gorillaau
      @gorillaau 6 лет назад +1

      Was it the same gesture or different gesture?

    • @RolandHutchinson
      @RolandHutchinson 5 лет назад +1

      If the universe did reset itself, how would we know?

  • @drjuju3331
    @drjuju3331 6 лет назад +12

    I love how excited these guys get about this stuff!! Very interesting

  • @JB-gi5ph
    @JB-gi5ph Год назад +1

    I love the quick reset of "The universe resets itself." Well played!

  • @Fiddlesticks86
    @Fiddlesticks86 5 лет назад +8

    7:40 I'm surprised the paper didn't implode into a black hole destroying the entire universe from what you just wrote on it 😂😂

  • @FreeAsInFreeBeer
    @FreeAsInFreeBeer 6 лет назад +18

    Dr Tony Padilla, I would love if you talked about busy beavers! I mean, Tree(3) is big alright, but it's still a computable function. Big fan of your videos, really love your enthusiasm!

    • @livedandletdie
      @livedandletdie 6 лет назад +5

      Shouldn't that be a computerphile video. n-state turing machines.

    • @synchronos1
      @synchronos1 6 лет назад +5

      It's already on the Computerphile, and prof. Brailsford videos are one of the best ones there.

    • @isuller
      @isuller 5 лет назад

      I'd love to see a proof that TREE(n) is a computable function. I'm not sure about that and I haven't seen a proof - although I've seen it being mentioned that it is computable several times.

    • @FreeAsInFreeBeer
      @FreeAsInFreeBeer 5 лет назад +1

      @@isuller A function is computable if there is an algorithm that can (given enough time) compute it. The simplest proof that the Tree-function is computable would be an implementation of that algorithm - it doesn't even need to be very efficient. We can even do it a normal programming language. The naive algorithm that requires the least imagination would be to do an exhaustive search of all possible forests for the given n and return the number of trees in the largest legal forest. The trickiest part would probably be to do the test for inf-embedding - but still conceptually doable. Feel free to reply if there are any questions! :)

    • @iainh
      @iainh 2 года назад

      Just a note but this actually happened and he spoke about them in the video regarding Rayo's Number.

  • @wan-hewtran1046
    @wan-hewtran1046 6 лет назад +47

    What's the most number of nodes in any tree in TREE(3)?

    • @connorrcompton
      @connorrcompton 6 лет назад +46

      Sarthak Bansal TREE(3) means three types of nodes. Not nodes in general.

    • @adamweishaupt3733
      @adamweishaupt3733 6 лет назад +15

      Sarthak no it's 3 colors of nodes, the nth tree can have n nodes, but they can only contain 3 colors.

    • @OctagonalSquare
      @OctagonalSquare 6 лет назад +7

      It would be 1. As with TREE(1) and TREE(2) you only use one of the single seed options until the very end. Once you have no options that don't include a previous tree, then you use your single seed options. If you use them at any point before the last two, then they will appear in other trees immediately, thereby ending the game prematurely.

    • @livedandletdie
      @livedandletdie 6 лет назад +1

      Octagonalsquare that was not the question though, his question was as followed.
      What is the global maximum f(x) on the curve that is the curve of nodes pertaining to each iteration of x in the well defined function TREE(n) when n does equal 3.
      Now as far as I'm concerned the upper bound to that question is
      TREE(3)^(1/3)

    • @limbridk
      @limbridk 6 лет назад +1

      That is the last tree Octagonalsquare, not the largest tree.

  • @michadreksler2401
    @michadreksler2401 3 года назад +6

    If you take tree(3) and substract 10% of it, and add all the numbers together, and then add all the numbers together, and so on as long as it will be just one number I bet this number is 9. 😊

  • @cabbageboi6365
    @cabbageboi6365 Год назад +1

    I love how the extra footage is longer than the original video

  • @Tossphate
    @Tossphate 6 лет назад +5

    "...how quasi is your ordering?"
    .."It's well quasi mate"

  • @regan3873
    @regan3873 4 года назад +5

    My mind is not abstract enough for this. I kind of get it when he explains it but I’m like “but how do they *know*?

  • @loweshaw
    @loweshaw 4 года назад +1

    Bravo on the cliffhanger from the first video to the second

  • @bsuperbrain
    @bsuperbrain 4 года назад +4

    When he says the universe resets itself, the running frame in the video resets itself. Funny trick! :D

  • @wyboo2019
    @wyboo2019 Год назад +4

    i think the awesome part of Tree(3) and some other large numbers is that they were not discovered with the intention of finding a large number. im not a part of it but in the Googology fandom there's all these efforts to create simple mathematical situations that give large numbers, but i just like to imagine that, when studying these trees, someone just accidentally stumbled upon Tree(3). its not even close to being as large as Tree(3) but the Monster Group is one of these; a fundamental building block of groups with just completely unexpected size and connection to modular forms

  • @evesolis6133
    @evesolis6133 5 лет назад +3

    Just mesmerizing to know that a game involving 3 seeds can exhaust the universe. All that happens during the day, how small you feel you are in the city, how magnificent or insignificant you find yourself, how much crazy thoughts you run through every second, how the existence of all creations of human non human, are not even holding a candle to a small game whose rule can be explained in 3 minutes

  • @arthurgrandao
    @arthurgrandao 5 лет назад +3

    I love how excited he is! You can see he just loves math

  • @jamminermit
    @jamminermit 6 лет назад +28

    What if you could prove tree(3) was prime...

    • @DiamondSane
      @DiamondSane 6 лет назад

      Call them when you have supersublinear algorithm.

    • @ydg7670
      @ydg7670 5 лет назад +1

      2^(13*TREE(3))-1=Big number, could be a prime. Maybe not.

    • @Double-Negative
      @Double-Negative 4 года назад

      @@ydg7670 100% not. There's a proof it's not.

  • @subscribefornoreason542
    @subscribefornoreason542 4 года назад +5

    These numbers just embarrass the size of space-time.

  • @gaspytheghost
    @gaspytheghost Год назад +2

    I just wanted to find out how big TREE(3) is, not have an actual existential crisis about the universe resetting itself.

  • @pinball1970
    @pinball1970 5 лет назад +15

    I got a bit lost after "tree"

  • @stevethecatcouch6532
    @stevethecatcouch6532 6 лет назад +19

    In all the gee whiziness about the size of the forest Dr. Padilla neglected to mention the, to me, fascinating fact that the tree(3) forest contains only one green node.

    • @015Fede
      @015Fede 6 лет назад +1

      Steve's Mathy Stuff well, it is not necessarily green, it could be black, or red, or maybe blue, or even purple

    • @RolandHutchinson
      @RolandHutchinson 5 лет назад +1

      I think we can just get away with assuming, without loss of generality, that it is green.

  • @Supware
    @Supware 5 лет назад +7

    I think it's beautiful that such ridiculous ideas come out of graph theory, given its simple axioms. I feel like I should get this experience from every field of math at some point..?

  • @WeLoveMusicStudio
    @WeLoveMusicStudio 3 года назад +1

    Tree (tree (3)) makes my heart heavy

  • @arturslunga3415
    @arturslunga3415 3 года назад

    This guy's enthusiasm is contagious!

  • @tdurran
    @tdurran 6 лет назад +71

    And yet it's true to say, almost every integer contains tree(3)

    • @AndrewHSW
      @AndrewHSW 6 лет назад +9

      tdurran That's something to think about.

    • @oz_jones
      @oz_jones 6 лет назад +34

      And almost every positive integer is bigger than tree(3)

    • @sage5296
      @sage5296 6 лет назад +4

      Woah yeah ... wow

    • @AnCoSt1
      @AnCoSt1 5 лет назад +6

      a stupidly mindblowingly correct statement

    • @austinbryan6759
      @austinbryan6759 4 года назад

      Darn you for exploding my head

  • @OxidoPEZON
    @OxidoPEZON 6 лет назад +7

    I love this guy, please make an interview about his life interests... PLEASE XD

    • @craftyraf
      @craftyraf 6 лет назад

      Subscribe to the Numberphile channel and you'll know...

    • @OxidoPEZON
      @OxidoPEZON 6 лет назад

      Raf M. I am, and know tidbits from him, but I don't know... Where does he get all this interesting topics if he works on physics. How does he know so much math, or is it not much, just what is asked for theoretical physics?

    • @calamorta
      @calamorta 6 лет назад

      Isn't he a Liverpool fan?

  • @ayushkumarjha9921
    @ayushkumarjha9921 Год назад

    Still remember the time when I first learn about a number called Trillion and that blown my mind and here are we now.

  • @ObsessiveClarity
    @ObsessiveClarity 3 года назад +1

    Stumbling across these numberphile videos in 9th grade, I for once was curious about something related to math. "Related to math." I didn't realize at the time that this *is* math, and this is largely how math feels to mathematicians. Exploratory, creative, boundless, surreal, and objective??? All at once? Wow. Fast forward a few years, and I'm just obsessed with math. I'm a math major. Thanks for the awesome videos!

  • @xnick_uy
    @xnick_uy 6 лет назад +154

    I like the enthusiasm, but I feel like I'm missing a bit more depth on the explanations. Just saying "it's really, really, really big" does not really explain how can you know that. For instance, I believe you when you say that TREE(3) > 2 ↑↑1000, because I don't think you are making this up. But how do I, the viewer, can understand the methods used to prove such claims? Maybe with some insights on these kind of questions we can share more of the amazement that this quantities brought to you...

    • @matthiasp3225
      @matthiasp3225 6 лет назад +26

      It's the poof that TREE(3) is finite using only finite arithmetic, that needs at least 2 ↑↑1000 symbols.
      I suppose if there is a way to explain why to a non mathematician it would need as much genius and effort as coming up with the more abstract and technical explanation that you can find online, but yes they could try it! It's the same with Grahams Number, Numberphile didn't accomplish to tell why it is an upper bound for the respective problem.

    • @eyvindjr
      @eyvindjr 6 лет назад +8

      I tried, there is a lengthy video series on youtube about E, diagonalisation and fast-growing-functions, how it dwarfs Graham's numger, ending up in explaining Tree(3), but I was not even close to being able to finish it. It is very heavy and advanced stuff!

    • @abcdefzhij
      @abcdefzhij 6 лет назад +35

      He wasn't saying that TREE(3) is greater than 2^^ 1000, lol. He was saying something much more profound that went over your head about the size of TREE(3).

    • @mrnarason
      @mrnarason 5 лет назад +1

      xnick go read up some graph theory then

    • @mattdombrowski8435
      @mattdombrowski8435 5 лет назад +5

      All of these papers that they use are publicly available (to varying degrees of paywall, however). You can satisfy your curiosity with those, although understanding them be difficult

  • @reub2338
    @reub2338 6 лет назад +33

    What about REDWOOD(TREE(3))?

    • @sage5296
      @sage5296 6 лет назад

      BLUEWOOD(TREE(3))

  • @strangequark420
    @strangequark420 Год назад

    This is one of the few RUclips videos that I watch over and over again. I'm iterated.

  • @vantarinitel
    @vantarinitel 8 дней назад

    "Does this make you happy?" YES

  • @johnny_eth
    @johnny_eth 4 года назад +4

    New excuse for not sound homework: "there's not enough entropy in the universe to contain my homework"

  • @user-ft4pb5vb3e
    @user-ft4pb5vb3e 6 лет назад +3

    4:39 I just got the image of some guy writing on a piece of parchment scrolling by incredibly fast, and then everything on the parchment disappears and the guy is like, "It reset again???"

  • @donjorgenson9906
    @donjorgenson9906 6 лет назад

    Man, I love this guy! Big up Tony!

  • @henjoyer
    @henjoyer 4 года назад +1

    We should have a super long video of just the digits of TREE(3) scrolling across the screen

  • @horvathbotons0
    @horvathbotons0 5 лет назад +3

    TREE(Graham's number) did I break the internet?

    • @ses694
      @ses694 4 года назад

      ...TREE(TREE(TREE(Grahams number)))... Until TREE(Grahams number) amount of TREE functions put into ...TREE(TREE(TREE(Grahams number)))... amount of TREE functions ...TREE(TREE(TREE(Grahams number)))... times