Alternating series #1 | Visual solution |

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  • Опубліковано 25 жов 2024

КОМЕНТАРІ • 217

  • @ThinkTwiceLtu
    @ThinkTwiceLtu  6 років тому +234

    Hello everyone. I just wanted to say thanks for all the support I've been getting from you guys. Means a lot.
    P.s. I will be starting my undergraduate degree in a few weeks so It might affect my upload schedule. Anyway I'll keep you guys updated on twitter.
    Peace~

    • @Kyle-li8wi
      @Kyle-li8wi 6 років тому +47

      Undergraduate?!?!

    • @dannyvr91
      @dannyvr91 6 років тому +15

      undergrad degree wtf?? u must be a genius

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому +65

      I'm just a guy with an animation software and an access to the internet. Whenever I read about some topic that fascinates me I just want to share it with you guys so I make these animations:)

    • @maaaaaaaaarcel
      @maaaaaaaaarcel 6 років тому +5

      What sources on the internet do you use?

    • @AnubhavGoswami3800
      @AnubhavGoswami3800 6 років тому +11

      You're making some amazing stuff, man. An inspiration, really.

  • @james3742
    @james3742 6 років тому +3

    Probally one of the most intuitive representations of an infinite geometric series that I have ever seen. Thank you for everything you do.

  • @nethols2185
    @nethols2185 6 років тому +38

    All of these help so much more than actual words

  • @yoavzack
    @yoavzack 6 років тому +6

    this is just brilliance in action

  • @WhiteboardMaths
    @WhiteboardMaths 6 років тому +2

    These animations are incredible!

  • @OrangeC7
    @OrangeC7 6 років тому +6

    These visual proofs are amazing, never stop making them if you can help it!

  • @vpambs1pt
    @vpambs1pt 6 років тому +37

    I find very interesting that many series and be "intuitively" seen, once you find the "perfect" scenario for each series, but the real problem is find the perfect scenario, for example who'd have though in solving this series geometrically, by using 3/4 of a square!
    By the way, I love the fact that in title of the video, I can see a "#1"!

  • @hubriss583
    @hubriss583 6 років тому +8

    I love your animations so much! They make maths less obscure

  • @thearmadilliestone
    @thearmadilliestone 6 років тому +14

    Series blew my mind when I first encountered them in calc

  • @manuelhoffmann4470
    @manuelhoffmann4470 6 років тому +1

    Very beautiful animation! I have never seen this approach and it blew my mind!

  • @italyball2166
    @italyball2166 6 років тому +5

    Elegant as always!

  • @WarheaddVids
    @WarheaddVids 6 років тому

    Got right to the point and super easy to understand. Great video!

  • @apofistetrahidrocannabinol3949
    @apofistetrahidrocannabinol3949 6 років тому

    Beautiful, as always

  • @ethangilchrist3534
    @ethangilchrist3534 6 років тому

    Beautiful as always

  • @neo_tsz
    @neo_tsz 6 років тому

    This is phenomenal

  • @thanostitan.infinity
    @thanostitan.infinity 6 років тому +5

    Thanks for these. All the best for future!

  • @Inyrth
    @Inyrth 6 років тому +32

    Always amazed when watching your video's

  • @KnThSelf2ThSelfBTrue
    @KnThSelf2ThSelfBTrue 6 років тому

    Oh my god. Your content is just... so on it. Why do we put kids through years of grueling classroom math lectures when the answers are sitting right there on UA-cam, laid out so clearly, and set to Chill Lo-Fi Beats to Study/Relax to.

  • @cabra500
    @cabra500 2 роки тому

    The simpler ones are so amazing!

  • @Conkerbrain
    @Conkerbrain 6 років тому +2

    Damn, absolutely love your stuff

  • @aks9545
    @aks9545 6 років тому

    Your editing skill are insane

  • @nikolamarijanovic6261
    @nikolamarijanovic6261 6 років тому +44

    It's amazing how all of the numbers are powers of 2 but somehow in the end we get 2/3

    • @Wild4lon
      @Wild4lon 5 років тому +2

      No. It math.
      c:

    • @TJStellmach
      @TJStellmach 4 роки тому +4

      Consider the decimal 0.111111111... All of the individual digits are powers of 10, but the sum is 1/9th.
      This sum is similar, except in base 2 rather than base 10. 2/3 in binary is 0.10101010...

  • @yaeldillies
    @yaeldillies 6 років тому +8

    My way to visualize this sum is by remarking that all negative terms are all half of the positive terms. So, the serie in fact equals 1/2(1 + 1/4 + 1/16 + ...) = 1/2 * 4/3

    • @pursuitsoflife.6119
      @pursuitsoflife.6119 5 років тому

      Yaël Dillies weird question to ask but are you from Martinique?

  • @markthrekrain8037
    @markthrekrain8037 6 років тому

    Beautiful, as always. Thank you very much

  • @guestimator121
    @guestimator121 6 років тому

    Simply beautiful

  • @funkysagancat3295
    @funkysagancat3295 5 років тому

    Amazing as always

  • @Udinanon
    @Udinanon 6 років тому +1

    Majestic

  • @yuvaleeus5eva
    @yuvaleeus5eva 6 років тому +1

    I love your videos so much, stay awesome! Like god damn I get such huge nerdgasms watching your videos haha

  • @guillaumed5527
    @guillaumed5527 6 років тому +2

    Super cool again m8 cheers up !

  • @Reforitor
    @Reforitor 5 років тому +1

    You're almost at 50k. Best wishes

  • @mohammedal-haddad2652
    @mohammedal-haddad2652 4 роки тому

    Ingenious!

  • @patrickwienhoft7987
    @patrickwienhoft7987 6 років тому

    Often when one of your videos starts I know the formula/result but I don't see how your approach is getting there. The feeling when it "clicks" in my head and I can foresee your punchline (0:34 here) is simply amazing in every single one of your videos. Thanks for your great content.

  • @b.a.r.c.l.a.y9701
    @b.a.r.c.l.a.y9701 6 років тому +2

    God has joined the game

  • @aaronhamilton8997
    @aaronhamilton8997 6 років тому

    Dayyumn. That was good. Give us moarr!!!!

  • @alonelyspoon
    @alonelyspoon 6 років тому +1

    Im so happy i found this channel from 3b1b :)

  • @connor5890
    @connor5890 6 років тому +1

    Woah, that was cool

  • @Gabtube252
    @Gabtube252 6 років тому +1

    great vid, would definitely recommend to a Calculus student that struggles with sums

  • @BrickfilmMan
    @BrickfilmMan 6 років тому

    Amazing!

  • @joske7804
    @joske7804 6 років тому +1

    great animation

  •  6 років тому +2

    Awesome!

  • @biswajitmahanta500
    @biswajitmahanta500 6 років тому +1

    Wow no dislikes. Keep it up😀😀

  • @shreyasraut6224
    @shreyasraut6224 6 років тому

    beautiful... Elegant

  • @santonusharma3899
    @santonusharma3899 4 роки тому

    You are making amazing stuff ... keep it up

  • @chanyoonjun
    @chanyoonjun 6 років тому +1

    Beautiful

  • @xavier2.044
    @xavier2.044 6 років тому +2

    Yay I learned something!

  • @radoslavhabarda1180
    @radoslavhabarda1180 6 років тому +1

    your videos are awesome

  • @LimeEffy
    @LimeEffy 6 років тому

    Fantastic visualization! What program are you using for the animation?

  • @EvilCherry3
    @EvilCherry3 6 років тому

    Great work !

  • @mmukulkhedekar4752
    @mmukulkhedekar4752 6 років тому +1

    Wow this is awesome .....I want some more pls

  • @luizfelipegarcia4676
    @luizfelipegarcia4676 6 років тому

    That was great!

  • @JustMe-ui9bv
    @JustMe-ui9bv 6 років тому

    This is fucking amazing! Can't get enought of this videos! Keep going. You have to.

  • @ErojFeeding
    @ErojFeeding 6 років тому

    beautiful videos, nice work

  • @rosettemasilang9749
    @rosettemasilang9749 4 роки тому

    i really appreciate this video more knowledge 👍

  • @VaibhavKarve
    @VaibhavKarve 6 років тому

    Great video! A small suggestion: think about typesetting your math equations in LaTeX. They'll look prettier.

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому

      true, I'll have to learn the LaTeX syntax at some point

  • @realcygnus
    @realcygnus 6 років тому +20

    cool

  • @trobin
    @trobin 6 років тому +23

    these animations are fascinating, what software do you use?

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому +11

      thank you! I used cinema 4D for this one

  • @LlNDEN
    @LlNDEN 6 років тому

    This is so good

  • @ethanw2450
    @ethanw2450 6 років тому

    This is so nice

  • @christiansinger2497
    @christiansinger2497 6 років тому

    Splendid

  • @redsalmon9966
    @redsalmon9966 6 років тому +1

    I remember this 4 L shape thingy, but I didn’t know it can perfectly visualise this alternating series

  • @JWentu
    @JWentu 6 років тому

    lovely!

  • @Gamikane
    @Gamikane 6 років тому

    I really should be sleeping right now but I can't stop watching

  • @taharahmani1547
    @taharahmani1547 6 років тому

    is it the right way to understand science : visualising in very particular dimensions theorems .
    you guys have reminded me of the Einstein's approach; trying to understand concepts by imagining thought experiments and finding physical interpretations of fundamental science. that is extraordinary .
    still is there a remarkable opinions about the nature of mathematics and it's concerns : Henri Poincarré said that one mathematical object can express a non-finite and different phenomena's and as as a consequence it can have an infinite interpretations . as I shall take an example of what I am talking about let us consider the Pythagorean theorem not from the geometrical view but from the one of probability and statistics:
    we have a pocket which contains "a" balls with different colours ("a" is whichever number we choose). Now, we can only pick 2 balls successively with reset . the number of possibilities ,of combination according to Pythagoras is equal to the number of possibilities if we use another pocket which contains "b" balls of different colours plus the number of possibilities in a pocket of "c" balls . and all of that done in the same conditions of experiment (successively and with reset) .
    and finally we have our new interpretation witch totally different from the one with cubes (geometric ) .
    a²=b²+c²

  • @ジャナ-b1p
    @ジャナ-b1p 6 років тому +1

    they should be teaching math this way in schools

  • @yashuppot3214
    @yashuppot3214 5 років тому

    I derived this myself except for 1/2-1/4+1/8 using an equilateral triangle and going back and forth along its sidelength by factors of what ever the term was, it a point along the same horizontal line as the centre of the triangle, which is 1 third up the side length. Therefore it is equal to 1/3

  • @MrRyanroberson1
    @MrRyanroberson1 6 років тому

    Well as the sum from 1 to infinity of 1/x^n is 1/(x-1), then sum(1/x^n) for x=-2 would be -1/3. The alternating series is secretly not an alternating series. Amazingly enough the 1/(x-1) deal works for all ||x||

  • @raterix2
    @raterix2 6 років тому +1

    Nice.

  • @linkspring1287
    @linkspring1287 6 років тому +1

    Wow..😍😍

  • @Makasu
    @Makasu 6 років тому +8

    is that an "spirit away" remix?

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому +2

      yes~

    • @Makasu
      @Makasu 6 років тому

      and very cool video!

    • @sirknight4981
      @sirknight4981 6 років тому

      *a
      Tip: Use "an" when the following word starts with a vowel (a, e, i, o, u) and "a" when the folowing word starts with a constanant (a letter that's not a vowel)

    • @Makasu
      @Makasu 6 років тому

      sorry, I'm not english basically...

  • @madhavjha5289
    @madhavjha5289 5 років тому

    Amazing

  • @ethanjensen661
    @ethanjensen661 6 років тому +1

    That was great

  • @Викторина-ъ3т
    @Викторина-ъ3т 6 років тому

    wooow its so cool

  • @abhinavshripad5356
    @abhinavshripad5356 6 років тому +1

    True genius

  • @Magnasium038
    @Magnasium038 6 років тому

    That is a beautiful start; to use 3/4 of a square. However, I don't think you needed to show the full square first. In fact, that actually confused me; because I thought going from the full to 3/4 square was your first step, and I paused to ponder why you had done that.

  • @namannarang4208
    @namannarang4208 6 років тому +1

    Nice vedio man I never expected the answer to be 2/3 I guessed 3/4 or I thought the denominator had to be even

  • @lucianorodriguez7726
    @lucianorodriguez7726 6 років тому

    wow I LOVE IT

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому +1

      thank you :)

    • @lucianorodriguez7726
      @lucianorodriguez7726 6 років тому

      Think Twice Thanks to you. you make that many people who dont understand or dont care about mathematics are surprised, to my that love maths, I am surprised and I cant stop showing these videos to people, although I know they will never like them as much as I do. Total thanks :)

  • @jeanhealey1354
    @jeanhealey1354 6 років тому

    Math porn was created here. The. best. videos. ever.

  • @hybrid6522
    @hybrid6522 6 років тому

    mind = blown, have a like duce 👍

  • @snowman7514
    @snowman7514 6 років тому +6

    Me : *amezed noise*
    Brotha : What?
    Me : Just Sigma(see my) favorite UA-camr's video

  • @Defeshh
    @Defeshh 6 років тому

    lovely

  • @luizsaad497
    @luizsaad497 4 роки тому

    Please make one video showing the visual for 1+2+3+... = -1/12
    That's so hard to figure out
    Thank you

  • @rohansonawane7634
    @rohansonawane7634 6 років тому

    Why you have taken a cube of part 3/4 and not total square

  • @undergroundmonorail
    @undergroundmonorail 6 років тому +1

    Gorgeous...

  • @serock3
    @serock3 6 років тому

    Daym, neat

  • @RiderOfMooses
    @RiderOfMooses 6 років тому

    What do you use to animate these? Do you code them?

  • @LinusL170
    @LinusL170 5 років тому

    Mind = blown

  • @taijusakai7276
    @taijusakai7276 6 років тому

    Can u do visual proof of 1-1+1-1+1-1+1-1+1-1+1-1+....
    =1/2

  • @imelse
    @imelse 6 років тому

    Smart smart, nėra pakankamai ilgo gabalo, tai tiesiog padalinai vieną video į kelis :D

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому

      haha jo, cia Lauris?

    • @imelse
      @imelse 6 років тому

      yup :D

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому

      as to ilgo video net neikeliau, sita trumpa greit padariau vietoj to:D

    • @imelse
      @imelse 6 років тому

      aaj, bet kelsi ir tą, ane? Aj, ir nice outro.

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому +1

      cj nekelsiu kolkas. nelabai gerai atordo :D. Dekui

  • @ratherblue140
    @ratherblue140 6 років тому +1

    Woah...

  • @srpenguinbr
    @srpenguinbr 6 років тому

    Do a visual proof that the volume of a pyramid is a third of the prism with the same base.

  • @eliasabi-elias8501
    @eliasabi-elias8501 5 років тому

    Hi guys. Can anyone link an algebraic proof of this series? Very hard to find not knowing how to type math notation into search engines. Thank you.

  • @Pedritox0953
    @Pedritox0953 4 роки тому

    Is the right direction but could more awesome

  • @longplays2420
    @longplays2420 6 років тому

    The way I did it was to split it into 2 different convergent series. The answer is the same, it just feels cooler.

  • @arijitchakrabarty1552
    @arijitchakrabarty1552 6 років тому

    Say, if n=1, it becomes 1-½ = ½. So how is your answer correct ?

    • @Yu123456Ji
      @Yu123456Ji 6 років тому +1

      Arijit Chakraborty you change the value of n, so it becomes (-1/2)^n => (-1/2)^1 = -1/2. You inverted -1/2 wirh n, be careful with these.

    • @arijitchakrabarty1552
      @arijitchakrabarty1552 6 років тому

      No no, that's not what i meant, and also, my question itself is kinda wrong, which i just figured out. Anyways, thanks for the tip.

  • @natasadjurdjevic3533
    @natasadjurdjevic3533 6 років тому +2

    I dont understand why are we starting with 3/4 of a square

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому +5

      you can start with any shape you want. In this case if we treat the area of 3/4 of a square as 1 and cut it up into 4 equal pieces it works out nicely. It's all about finding a suitable shape to start with.

    • @EvilCherry3
      @EvilCherry3 6 років тому +1

      The (very good) idea of starting with 3/4 of a square comes from the fact that we already know that the result will be 2/3 before trying to create this visual demonstration.

    • @andrewclarke598
      @andrewclarke598 6 років тому

      Think Twice it would have made way more sense to me to start with one whole square. The first three terms just get you to 3/4, since w minus 1/2 + 1/4 = 3/4. I honestly found this video confusing because of that.

    • @andrewclarke598
      @andrewclarke598 6 років тому

      W should be 1 in the above comment

  • @itsok8003
    @itsok8003 6 років тому +1

    👍

  • @avocadosauce6840
    @avocadosauce6840 6 років тому +16

    If you do 1-1/3+1/5-1/7+1/9... and so on then multiply by 4 you get PI

    • @completeandunabridged.4606
      @completeandunabridged.4606 6 років тому +10

      Just in case you didn't know that comes from an infinite series which will give you the inverse tangent of a number. In general it is x - x^3/3 + x^5/5 - x^7/7 + ... so when you have x as 1, you are given the sum in your comment.

    • @daksh8747
      @daksh8747 6 років тому +5

      Taylor series, my arch-nemesis

    • @nazishahmad1337
      @nazishahmad1337 6 років тому +2

      yess because 1-1/3 +1/5-1/7.....=π/4
      haaahahaha

    • @fakestory1753
      @fakestory1753 5 років тому

      3blue1brown have a video of explain how you get pi/4, go to see it

  • @tranl1050
    @tranl1050 6 років тому +1

    Spirited away????

  • @가시
    @가시 6 років тому

    3blue1brown?

  • @natnatschool3538
    @natnatschool3538 6 років тому +1

    Since you said, you just finished school: what did it feel like to be recommended by 3blue1brown? (Ps awesome video as always! Really appreciate that he recommended you)

    • @ThinkTwiceLtu
      @ThinkTwiceLtu  6 років тому +1

      I was really happy of course! I've been a fan of 3b1b for a long time so I was excited when I found out that he will feature me on his channel. It's an honor to me :)