Why π is in the normal distribution (beyond integral tricks)

Where's the circle? And how does it relate to where e^(-x^2) comes from?
Help fund future projects: / 3blue1brown
Special thanks to these supporters: www.3blue1brown.com/lessons/g...
An equally valuable form of support is to simply share the videos.
The artwork in this video is by Kurt Bruns, aided by Midjourney
Here are several other good posts about the classic Poisson proof
vcubingx: • Why does pi show up he...
BriTheMathGuy: • This isn't a Circle - ...
Dr. Alter's math library: idan-alter.github.io/2023/02/...
And if you'd like to see many other variations on approaching this integral, take a look at this expository paper from Keith Conrad: kconrad.math.uconn.edu/blurbs...
Correction: 13:46 - The denominator should read 2πσ^2
Timestamps:
0:00 - The statistician's friend
3:44 - The classic proof
12:47 - The Herschel-Maxwell derivation
21:55 - Reflecting back on the proof
23:50 - A bonus problem
Thanks to these viewers for their contributions to translations
French: Jeremy Senn, Laurent Joubert
German: dreivmeister, lprecord, mathiashaebich
Hebrew: David Bar-On, Omer Tuchfeld
Hindi: prateekbansal97
Spanish: Joel Tovar
Turkish: kilobravo3
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These animations are largely made using a custom python library, manim. See the FAQ comments here:
www.3blue1brown.com/faq#manim
github.com/3b1b/manim
github.com/ManimCommunity/manim/
You can find code for specific videos and projects here:
github.com/3b1b/videos/
Music by Vincent Rubinetti.
www.vincentrubinetti.com/
Download the music on Bandcamp:
vincerubinetti.bandcamp.com/a...
Stream the music on Spotify:
open.spotify.com/album/1dVyjw...
------------------
3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with KZread, if you want to stay posted on new videos, subscribe: 3b1b.co/subscribe
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Пікірлер: 1 600

  • @3blue1brown
    @3blue1brown10 ай бұрын

    The follow-up to explain how this fits into the central limit theorem: kzread.info/dash/bejne/lpOl2K59mM7NYJM.html That video, in turn, benefits from a little prerequisite knowledge about convolutions, which I cover here: kzread.info/dash/bejne/e5WHqdOKkZi1XbA.html

  • @apointonacurve

    @apointonacurve

    7 ай бұрын

    Still, why is the 1/2 in the exponent?

  • @redsix5165

    @redsix5165

    3 ай бұрын

    5:08 just some feedback- I dont think you should display the integral expressed as a function of time and not explain that. Too often y’all are just too smart and drop big ideas like they are obvious. It is not obvious how your function can be expressed as x then swap out x for t. Maybe its just poor “math grammar” that science has adopted…idk - bc philosophically- if you need the integral function to be expressed as time (?acceleration) and the function is purely based on space, that is quite interesting

  • @Voice-OverM

    @Voice-OverM

    2 ай бұрын

    I can help you my friend I work as a voiceover ...I am arabian ...I can do voiceover. I will present it to you "free" as a thank you gift, in support of the channel

  • @kylehart643
    @kylehart643 Жыл бұрын

    "Who ordered another dimension" 😂 classic mathematician path to solving a problem

  • @InTrancedState

    @InTrancedState

    Жыл бұрын

    Only PhD mathematicians have enough math money to order the 11 dimensions needed for string theory

  • @agrajyadav2951

    @agrajyadav2951

    Жыл бұрын

    ​@@InTrancedState We only get 3 and these elites get 11 Unfair

  • @gallium-gonzollium

    @gallium-gonzollium

    Жыл бұрын

    “Sir, this is a Wendy’s”

  • @lietpi

    @lietpi

    Жыл бұрын

    I'll have 4 dimensions with extra dip.

  • @numairsayed9928

    @numairsayed9928

    Жыл бұрын

    String theorists af

  • @sayefhasan9339
    @sayefhasan93393 ай бұрын

    Who else came here just to listen Grant speak Korean?

  • @maxpettit2343

    @maxpettit2343

    3 ай бұрын

    Me!!

  • @afnankabir2190

    @afnankabir2190

    3 ай бұрын

    That'd be me, even tho it not being my native language

  • @florianadamczyk8208

    @florianadamczyk8208

    3 ай бұрын

    Yep ;)

  • @karl70552

    @karl70552

    3 ай бұрын

    Me (but I also wanna know why pi shows up in the normal distribution)

  • @knitd1985

    @knitd1985

    3 ай бұрын

    🙋‍♂️

  • @billtruttschel
    @billtruttschel Жыл бұрын

    Grant, as a lowly college lecturer with insufficient funds to donate to your cause, I must nonetheless congratulate you on another masterpiece. Your visualizations are second to none and your teaching is beyond fantastic. Thank you for your contributions to mathematics.

  • @oszkarvarnagy7896

    @oszkarvarnagy7896

    Жыл бұрын

    raise this man to the top of the comments.

  • @zacwarnest-knowles9139

    @zacwarnest-knowles9139

    Жыл бұрын

    @@oszkarvarnagy7896 fax

  • @jaw0449

    @jaw0449

    Жыл бұрын

    Same

  • @0ptic0p22

    @0ptic0p22

    Жыл бұрын

    god damn ma man be talking like nepolean

  • @JO-gz8om

    @JO-gz8om

    10 ай бұрын

    @@jaw0449I’ll

  • @DasIllu
    @DasIllu Жыл бұрын

    I think pi gets really sad whenever e is not around. It's not just love. It's a rather complex relationship. No wonder, both of them seem to be a bit irrational. Especially e gets fouriously impotent when pi is not around, despite pi's negativity.

  • @david13579naranja

    @david13579naranja

    Жыл бұрын

    I feel like impotent is not a random word but another reference I am missing

  • Жыл бұрын

    ​@@david13579naranja potentiation is just another name for "raising a number to the power of another"

  • @user-iv4dh7zp7s

    @user-iv4dh7zp7s

    Жыл бұрын

    e^(i*pi)+1=0 is probably the most wholesome thing in the mathematical world

  • @doodmithut7844

    @doodmithut7844

    Жыл бұрын

    Their relationship truly transcends the ones of real life.

  • @defenestrated23

    @defenestrated23

    Жыл бұрын

    Bravo!

  • @fari1964
    @fari1964 Жыл бұрын

    Him saying "feel less out of the blue" at 22:10 after deriving the proof visually and in BLUE is like the 10th bonus point for this channel. I love it so much

  • @huawafabe

    @huawafabe

    Жыл бұрын

    Three parts blue 🔵, one part brown 🟤

  • @publiconions6313

    @publiconions6313

    Жыл бұрын

    Really .. the best source of the feeling of epiphany this channel is. People love to criticize the internet.. but 30 years ago, you would've had to pay a bunch of $ to aquire such regular epiphanies

  • @pigismyname

    @pigismyname

    Жыл бұрын

    Does your bully call you blue butt too?

  • @cod3builder701

    @cod3builder701

    Жыл бұрын

    what are the other 9

  • @minerharry
    @minerharry Жыл бұрын

    1:45 put such a wide smile on my face and reminded me why I love this channel so much. So often the explanation for why a thing is is entirely proof based. I love proofs, and coming up with proofs is a wonderful experience of problem solving, but on their own they cannot *satisfy* my disbelief. Stuff like this, using the concepts and *reasoning* /within/ the proofs to make a point, is exactly what I love about math. Thank you, grant!

  • @simonvutov7575

    @simonvutov7575

    Жыл бұрын

    fun times

  • @3blue1brown

    @3blue1brown

    Жыл бұрын

    I do think the goals of understanding and proof should be thought of as separate. Both are deeply important and sometimes they coincide. It's often incredibly fun and enriching to follow a good proof with the exercise of saying "right then, so where on earth did that come from?"

  • @edwardlulofs444

    @edwardlulofs444

    Жыл бұрын

    Well, it certainly makes learning this material easier. From experience, it was much more difficult to learn it only by textbooks, professors and interacting with other students. But grad school was one of my favorite ways to spend time.

  • @Houdini111

    @Houdini111

    Жыл бұрын

    Yeah. Using math to solve math does make it far less real feeling. You just have to take it at its face value. Trying to relate these numbers and concepts back to the real world is hard (which is basically the whole point of this channel) but is very satisfying to see.

  • @carstenmeyer7786

    @carstenmeyer7786

    Жыл бұрын

    @@3blue1brown While I'd generally agree (especially when cumbersome rigorous notation may hide the underlying principles of a proof), very satisfying proofs often seem to combine their concepts and the necessary notation elegantly and effortlessly. It is a bit like witnessing skilled craftsmanship -- using the exact right tool for a job leads to not only a beautiful result, but a very satisfying process to get there in the first place. Thank you very much for capturing that beauty!

  • @jmcsquared18
    @jmcsquared18 Жыл бұрын

    That we live in an age where educators have the opportunity to unpack the meaning and history behind some of the greatest mathematical discoveries for a substantially large audience is a privilege that we should all be infinitely grateful for.

  • @aucsiya
    @aucsiya3 ай бұрын

    Just watched the video again with your Korean AI voice. As a Korean, I'm genuinely blown away-it sounds incredibly natural! Imagining how this will broaden accessibility to your fantastic math content is truly exciting 👏

  • @lifinale

    @lifinale

    3 ай бұрын

    I should inform you that this is AI lol

  • @yoonhenri4713

    @yoonhenri4713

    3 ай бұрын

    @@lifinaleWOW I think he had no idea when he wrote that

  • @Karlswebb

    @Karlswebb

    3 ай бұрын

    @@lifinaleYes… they said his AI voice…

  • @lifinale

    @lifinale

    3 ай бұрын

    @@Karlswebb they edited the post…

  • @paradoxicallyexcellent5138
    @paradoxicallyexcellent5138 Жыл бұрын

    More than perhaps any video in 3b1b, this one shows how learning math history makes one a better mathematician. What a great lesson!

  • @hectorcelis678

    @hectorcelis678

    Жыл бұрын

    The same beauty in math and history: the best part is the story behind the facts.

  • @dylanparker130

    @dylanparker130

    Жыл бұрын

    How true!

  • @histeward
    @histeward3 ай бұрын

    The Korean version sounds very natural. The pipeline works incredibly well!

  • @dominicveconi4301
    @dominicveconi4301 Жыл бұрын

    Grant, I’m a mathematician and math educator. I’ve of course seen the integration proof of the computation of the area under e^{-x^2}, but never in my life have I either seen or come up with such an elegant demonstration for why we MUST expect pi to show up in the Gaussian. Thank you, sir. Actually this gives me an idea for an in-class activity for my future analysis students…

  • @hierroflamencoguitar3658

    @hierroflamencoguitar3658

    4 ай бұрын

    1/sqrt(2pi) is also "incidentally" the normalization factor when you want to build an orthonormal basis of an infinite dimensional L2 space from the functions e^(ikx). This factor is what it takes to make the norm of each such element =1. And that's also how the area of the Normal gets calibrated to 1. So you could approach this from a number of angles... (Disclaimer, not a mathematician, but just sayin'.)

  • @moralboundaries1
    @moralboundaries1 Жыл бұрын

    I love everything about your videos. Your amazing animations, masterful scripts, pleasant and well recorded voice, tight editing. It all comes together to create some of the best educational content the world has ever seen. Thank you for sharing this for free and enriching the intellectual lives of so many people. ❤

  • @andrerenault
    @andrerenault Жыл бұрын

    I love the pieces of art that aren’t normally part of the “aesthetic” of 3b1b but somehow still fit right in.

  • @patrickguest2762

    @patrickguest2762

    Жыл бұрын

    i was gonna say... also the light in that piece of art is something beautiful

  • @tobiascornille

    @tobiascornille

    Жыл бұрын

    I wonder if it's AI generated. Looks so to me, cause the hands are bad 😅

  • @KernelLeak

    @KernelLeak

    Жыл бұрын

    I thoroughly dislike the part where it says "aided by Midjourney"... yuck.

  • @raptor4916

    @raptor4916

    Жыл бұрын

    @@KernelLeak Midjourney is just like any other artist, it learns by looking at 1000s of examples

  • @Aredtyg

    @Aredtyg

    Жыл бұрын

    ​@@tobiascornille Well, I doubt there are too many paintings of statisticians explaining the Central Limit Theorem to their friends while at lunch...

  • @user-vt6td9hp3g
    @user-vt6td9hp3g Жыл бұрын

    This makes me think: a series on statistics would be excellent. I am sure there is a lot of visualisation behind all the sum of squares and F statistics, of interactions and everything, that are never taught. Even "serious" books barely talk about the intuition of the sum of squares beyond how they are derived from LRT.

  • @nadaelnokaly4950

    @nadaelnokaly4950

    Жыл бұрын

    yess please, who else need more stats videos? +1 here

  • @JoshSmith-db2of

    @JoshSmith-db2of

    Жыл бұрын

    Grant has said in the comments section of the other videos in this series that he anticipates making a stats series soon! These videos will be a part of it.

  • @LillianRyanUhl
    @LillianRyanUhl Жыл бұрын

    You know I actually learned the proof about spheres you mentioned by hand proving it for my harmonic analysis class last semester! I was hoping to be able to learn more about abstract harmonic analysis and/or wavelets when I set out in that course, but it actually wound up being a very classical class, and featured many diversions on historical analytic number theory, special functions, and computational techniques. It was not at all what I was expecting at the outset, but it was fascinating! Also, I'll mention that I was one of the people who got to meet you at JMM, and got a picture! I've been following your content for years, and you're still such an inspiration to the way that I communicate math to non-mathematicians, even if I know most of the content that you post these days! I still find it very interesting and always a good review though :)

  • @ahmedgabr8009
    @ahmedgabr8009 Жыл бұрын

    I doubt anyone can possibly make a better visualization for explaining this proof. The quality of your videos is truly on another level

  • @v2ike6udik

    @v2ike6udik

    11 ай бұрын

    You can always add bombs and blisters :')

  • @coffeeguy.3438
    @coffeeguy.3438 Жыл бұрын

    Finally, the much awaited 3b1b statistics series is on a roll!

  • @mayurmatada6298
    @mayurmatada6298 Жыл бұрын

    Just wanna Say, Thanks for doing whatever you are doing. Never stop 3B1B

  • @Joyexer
    @Joyexer Жыл бұрын

    It always blows me away not only how good your animations look, but also how well they underline the concept you are teaching!

  • @PianoPsych
    @PianoPsych Жыл бұрын

    This video is breathtakingly marvelous! You elegantly answered several lingering questions that I thought I held separately and brought it all together in a visually stunning package. It was like a gift from heaven. You remind me of why I love mathematics so much. I'll be rehearsing this lesson in my mind for years to come. You've earned every penny of Patreon support I've given to date on this one video alone, and I have enjoyed so many others. Many, many thanks for sharing your extraordinary gifts with us.

  • @johnchessant3012
    @johnchessant3012 Жыл бұрын

    Even though I've seen this proof like a hundred times, it still brings a smile each time especially when animated as beautifully as here! And 3b1b did not disappoint, this really is a new perspective on it and I can't wait for the next video.

  • @Lavamar
    @Lavamar Жыл бұрын

    This was such a great video! Well paced, framed and explained. I only hope that the last part comes out soon. Excited!

  • @VioletCatastrophe
    @VioletCatastrophe Жыл бұрын

    The problem at the end was a delight to solve honestly. Part 2 was a really fun extension of the initial trick in the video. Thanks for sharing it. The video itself was also equally great.

  • @Me-0063
    @Me-0063 Жыл бұрын

    Love the video! I really like how you explain such complex things so simply and in such short time!

  • @Rightsideup23
    @Rightsideup23 Жыл бұрын

    YES YES YES! Thank you so much! When I took statistics, I always had this sense that I was missing something, because I never had the same intuition for it that I did for other areas of math. Something about this video just made everything click. Keep up the good work!

  • @steffenvraagidius1701
    @steffenvraagidius1701 Жыл бұрын

    Great video. I love the storytelling in this video. To me, one of the fun parts of working in the field of math, is the social aspect of sharing knowledge and the explaining and reasoning which gives me joy, and the pictures of the people talking in a café adds to that feeling. I have a freind, who everytime we meet, demands me to explain some math to him, so that he can get his mind blown. This video made me think of that.

  • @andrewpearce6943
    @andrewpearce6943 Жыл бұрын

    I'm guessing Grant is building up to a 23 minute video explaining a function that describes everything everywhere

  • @lookupverazhou8599

    @lookupverazhou8599

    Жыл бұрын

    God.

  • @BB-yi1oq

    @BB-yi1oq

    Жыл бұрын

    all at once

  • @shoam2103

    @shoam2103

    10 ай бұрын

    ​@@BB-yi1oqalmost!

  • @hak0bu
    @hak0bu3 ай бұрын

    Bro the Korean sounds so good. It is slightly low volume and muted, but overall very promising!

  • @Kynitt
    @Kynitt Жыл бұрын

    I think this is the best video you've ever made. I absolutely love the distinction you make between proofs that are beautiful (slick, elegant, clean) and proofs that provide intuition (clearly use the assumptions that they start with). I can't wait for the finale!

  • @AriaHarmony
    @AriaHarmony Жыл бұрын

    It's teacher appreciation week, and I must name you one of the best teachers I have ever had, Mr Grant! Your calculus and linear algebra series opened doors for me, thank you so so much!!

  • @mehtubbhai9709
    @mehtubbhai9709 Жыл бұрын

    I LOVE THIS CHANNEL!! I have always wondered what pi was doing there. Thank you so much Grant for throwing back the covers. You truly have reawakened my wonder for Math

  • @artyom2801
    @artyom2801 Жыл бұрын

    This has actually made me understand statistics better than my university when discussing Radiation measurements. It wasn't alone as I went out of my way to look up further information beyond the supplied reading material, but it definitely helped and motivated for me to do such, thanks for that.

  • @mdabusaqibalamansari9979
    @mdabusaqibalamansari9979 Жыл бұрын

    Amazing video. Your explain things soo well. Maths seems so much fun with your videos

  • @AdamSmith-ne9jm
    @AdamSmith-ne9jm Жыл бұрын

    I'm so incredibly happy you're doing the probability videos. Been waiting for this series since first discovering your channel 5 year ago! The linear algebra one boosted my gpa by probably a full point lol

  • @kashyapbrahmandam3586
    @kashyapbrahmandam3586 Жыл бұрын

    i wish I could be a mathematician like you. The ability to intuitively explain these stuff is very uncommon and it really stems out of your admiration and curiosity towards the subject. Thank You!!

  • @ArgentineTangoRadio
    @ArgentineTangoRadio Жыл бұрын

    Great explanation, as usual! Minor historical correction: at 21:40 you say that Maxwell "independently stumbled upon the same derivation" as Herschel. The current scholarly consensus is that Maxwell read Herschel's paper and adapted his proof to the kinetic theory of gases, so it was not independently discovered. For details (as well as details that may be useful for your next promised video) see B. Gyenis (2017) "Maxwell and the normal distribution" in Studies in History and Philosophy of Modern Physics vol 57, doi: 10.1016/j.shpsb.2017.01.001 .

  • @benjaminclehmann
    @benjaminclehmann Жыл бұрын

    The Herschel-Maxwell derivation is also a very nice justification for why Gaussian convolutions are separable (i.e. you can apply a gaussian blur to an image by blurring it only in the horizontal direction and then blurring that vertically).

  • @physicsguybrian
    @physicsguybrian Жыл бұрын

    Your presentation style and graphics are absolutely outstanding!!! A true pleasure to watch and learn from! Thank you!!!!

  • @thelifeofahuman3666
    @thelifeofahuman366611 ай бұрын

    I have done engineering from a very lowly college but still, my engineering math teacher was so succinct in teaching exactly how you have taught with animation at that time I didn't care enough but now watching your video just made me realise there are good teachers in every corner but we just pass them and don't appreciate their hard work. Your channel always helps in learning new things and re-learning what is hidden inside our minds. Thank you so much for your contribution.

  • @unebonnevie
    @unebonnevie Жыл бұрын

    I go to this channel whenever I want to feel elevated intellectually! Great stuff on math!

  • @OwenMcKinley
    @OwenMcKinley Жыл бұрын

    Thank you Grant I live in a time period where I can see this in my hand from the comfort of my couch. World class, exceptional I'm grateful!

  • @TheFireBrozTFB
    @TheFireBrozTFB Жыл бұрын

    I love this, I made a project about volumes of spheres in higher dimensions in the past, and watching this video added a lot more clarity and understanding! Ty for the great content!

  • @user-le9xu2mf5g
    @user-le9xu2mf5g10 ай бұрын

    I really appreciate that you elaborate some trivial things, as, for example in 8:40. You spell out exactly, what taking an antiderivative value at point \inf means. Your manner of spelling things out in concise yet meaningful way is extremely helpful Keep up your incredible work, Grant!

  • @HideD62
    @HideD623 ай бұрын

    AI인걸 못 느낄정도로 어마어마하게 자연스럽네요. 억양이 살짝 단조롭다는 느낌은 들지만, 대본을 읽는 사람들은 보통 이렇게 말하거든요.

  • @MadaxeMunkeee
    @MadaxeMunkeee Жыл бұрын

    I’m glad you put “beyond integral tricks” in the title, otherwise I would have scrolled past lol. I didn’t know about Herschel’s derivation. This is a great video, thanks for making it!

  • @wpgg5632
    @wpgg5632 Жыл бұрын

    Really wonderful, both demonstration and your manner to explain is such a real beauty ! Thanks for that

  • @limit22
    @limit22 Жыл бұрын

    you are part of the reason why the world will be smarter and achieve more. the impact you and your channel will have on people. I wish I had this growing up

  • @gabrielebartolini6679
    @gabrielebartolini6679 Жыл бұрын

    I don't know how this is possible, I was thinking about this thing right today, thank you 3blue1brown!

  • @markkennedy9767
    @markkennedy9767 Жыл бұрын

    Again, I'm blown away with how Grant is all about how someone could rediscover maths and is suspicious of tricks in doing maths. Without doubt, the best maths channel on KZread. He just gets what learning maths is all about: how would someone rediscover for themselves why something is the way it is- to feel the maths in their bones, not just remember tricks. Just brilliant.

  • @freudsbreakfast4060
    @freudsbreakfast4060 Жыл бұрын

    I absolutely love you and your videos. I'm a math and computer science major. Between the statistics of building neural networks and the math of fourier analysis that I've been studying in detail in school, these last three videos have given me such a synthesis and crystallization. Everything is connected, and math is the language that describes those patterns!

  • @sphatak11
    @sphatak11 Жыл бұрын

    This is incredible. Thank you for explaining with such amazing clarity. It will be hard to top this.

  • @ColeCoug
    @ColeCoug Жыл бұрын

    These gaussian integrals are all over the place in quantum field theory! My QFT homework also taugt me a fun relationship between the area of the unit sphere in D dimensions and the Gamma function. 2 pi^(D/2) / \Gamma (D/2) . Would love to hear your thoughts on renormalization sometime that stuff is WILD. The Zeta function even shows up sometimes. I've started to make my own visualizations for physics and I find them so helpful. Great video!

  • @giacomocorvi7896

    @giacomocorvi7896

    Жыл бұрын

    Looks like the footnote at the end of the video can be generalized to non-integer dimensions

  • @Vitorruy1
    @Vitorruy13 ай бұрын

    Im here for the Korean AI dub

  • @smirnoff_the_best_vodka

    @smirnoff_the_best_vodka

    3 ай бұрын

    Man hold up, that's AI??

  • @Ihate_rice

    @Ihate_rice

    3 ай бұрын

    ​@@smirnoff_the_best_vodkayes, he said it in the post

  • @honehan-yh3fj

    @honehan-yh3fj

    3 ай бұрын

    wow. amazing.. so realistic

  • @manuelbeato13
    @manuelbeato13 Жыл бұрын

    One of the best videos I have seen in quite some time. Loved the curious and pedagogical approach.

  • @bramfran4326
    @bramfran4326 Жыл бұрын

    Hands-down perfect video. I am patiently waiting for the next one, it is going to be a revelation!

  • @IseOnCrack
    @IseOnCrack Жыл бұрын

    I love how you explained intuitively the Jacobi determinant for the polar transformation, you’re way of explaining math is amazing

  • @dan-florinchereches4892

    @dan-florinchereches4892

    Жыл бұрын

    Yeah that was fun. I remember me skipping class a lot in Uni and just cramming double integrals without going to class just trying to solve the exercises. One of them was triple integral for sphere volume and i had no good parametrisation with nice bounds in mind. And then i remembered a book about a tank crew positioning the turret by rotating the canon with 2 angles for azimuth and zenith. That was when i naively discovered polar transforms and even funnier I just naively represented x y and z as terms of R alfa and beta then pretended I did a variable change and just calculated dx dy and dz plugged in and somehow got the right result. Many years had passed until i found out the jacobian from algebra was actually not put there to torture us😂

  • @nothinginteresting1662
    @nothinginteresting1662 Жыл бұрын

    If anyone is wondering how b^x can be written as e^(cx), it can be done because b^x = e^(ln(b^x)) = e^(x*ln(b)) = e^(x*c) = e^(cx), where c = ln(b) *Edit:* If c is negative, it implies that b lies between 0 and 1.

  • @im-Anarchy

    @im-Anarchy

    Жыл бұрын

    what's the time stamp

  • @nothinginteresting1662

    @nothinginteresting1662

    11 ай бұрын

    @@im-Anarchy Around 20:05 is when b^x is written as e^(cx)

  • @im-Anarchy

    @im-Anarchy

    11 ай бұрын

    @@nothinginteresting1662 actually that was pretty easy but I am grateful If you are okay with solving my doubt which is. 14:44 how the hell f(x,y)=g(x)h(y)

  • @nothinginteresting1662

    @nothinginteresting1662

    11 ай бұрын

    @@im-Anarchy g(x) and h(y) are distributions of x and y respectively. Then it is shown that g and h are equivalent because there is no difference after switching the axes. The reason for having g(x)h(y) is that x and y are independent of each other. If they were not, it would have reduced to a single variable function in either x or y.

  • @im-Anarchy

    @im-Anarchy

    11 ай бұрын

    @@nothinginteresting1662 that's ok now let me ask a personal question are you a student or working profesinal , entrepreneur. are you successful and happy, because I want some career guidence

  • @saltrocklamp199
    @saltrocklamp1999 ай бұрын

    I keep finding in math that learning the history of how an idea was discovered serves to illuminate the idea in general, and makes the "modern" version of that idea so much more satisfying as well as easier to work with. Thank you as always.

  • @SalehFawaz
    @SalehFawaz Жыл бұрын

    From the moment I first learned about the fascinating concept of the Gaussian Integral, I had hoped that 3Blue1Brown would produce a video on the subject. And true to form, the video they created was truly exceptional. Grant's expertise and presentation style were truly captivating, and I am grateful for the opportunity to have learned from such a talented educator. Thanks Grant.

  • @banaverhel
    @banaverhel Жыл бұрын

    I love how this channel is a gateway for amateur mathematics enjoyers (like me) to gain an intuition on a topic and be able to contextualize and explain these (admittedly rather complex) concepts. I, for example, am a high school student who loves learning about math but my teachers refuse to talk about anything other than basic high school math and give us hundreds of pages of excersises to mechanically compute. On the other hand, I cannot really understand the dense mathematical textbooks for university-level students as firstly, I do not even know the motivation or reasoning behind the proofs and derivations therein, but I also do not understand what the notation means in practice. However, your videos provide the bridge that lets an uninitiated, amateur mathematician understand and learn about these things. For example, after watching your calculus series like 3 times I finally understand the stuff in calculus textbooks and I could follow the proofs and the rigorous definitions there. Therefore, I think it’s no underestimation that you have changed the course of the most mathematics enthusiasts’ lives, including me, of any person ever. Thank you for your hard work!

  • @miguelangelmartinezcasado8935
    @miguelangelmartinezcasado8935 Жыл бұрын

    I was this week reading a paper on how to create neural networks that outputted a measurement and a covariance. And that pi was really something weird in the loss function that I could not understand. Thanks for making math more bearable!

  • @yuhanmao6512

    @yuhanmao6512

    Жыл бұрын

    Hi Miguel, that sounds like a very interesting paper, would you mind sharing the name?

  • @kostoffj

    @kostoffj

    Жыл бұрын

    @@yuhanmao6512 yes, please share

  • @haoming3430
    @haoming3430 Жыл бұрын

    My gosh, this is just mind blowing. It just gives you a totally in-depth way to look into things.

  • @danielagentile5355
    @danielagentile5355 Жыл бұрын

    The quality is getting better and it was already perfect

  • @12321dantheman
    @12321dantheman Жыл бұрын

    Ohhh i just realised that that's why the maxwell boltzmann distribution is what it is. I like this a lot more than the proof we saw in uni, which iirc used quantum mechanics (which maxwell didn't know about). Very cool thanks

  • @joekerr3638

    @joekerr3638

    Жыл бұрын

    Love the user name

  • @yecinemegdiche3202
    @yecinemegdiche3202 Жыл бұрын

    Always wondered why the normal distribution is the way it is. The explanation in this video is extremely satisfying. Thank you!

  • @NimrodTargaryen
    @NimrodTargaryen Жыл бұрын

    Beautiful, elegant and easy to understand... congratulations 🎉

  • @ridazouga4144
    @ridazouga4144 Жыл бұрын

    Man it's so unfair that you didn't get a mathematical prize and recognition for creating this historical channel

  • @davidnoll9581
    @davidnoll9581 Жыл бұрын

    A vaguely interesting little thing I realized a while back is you can write that as e^(-x)^(x) ... So there's a sense in which there's an exponential going in one direction, and then another going in the opposite direction. In this way, it feels to me to reflect 2 opposing exponential forces... Another way to look at it that is a little more circle-y is e^(i*pi)^(i*pi)... It works for matrices too (applying the linear transformation to rotate by 90 degrees twice yields something gaussian), and of course the infinite sums, but I guess that's all just kind of just recapitulating definitions. I spent way more time than I should have trying to figure out if there's anything deeper there and I couldn't find anything though

  • @aarong2374
    @aarong2374 Жыл бұрын

    Thank you for this video. I, so like many, wish I had this during my studies. I'm glad that this will be available for those new into this field.

  • @darnelwashinton1295
    @darnelwashinton1295 Жыл бұрын

    Thanks for all your work!

  • @ttiff97
    @ttiff97 Жыл бұрын

    5:32 One way I’ve solved the integral of e^(-x^2) is to use the Taylor expansion of e^x (this was during my university days). As mentioned, the anti derivative is non-elementary

  • @Anvilshock
    @Anvilshock Жыл бұрын

    "the question raised by the hypothetical statistician's friend" - You heard it, even 3b1b thinks statisticians have no real friends.

  • @kayrasener5142
    @kayrasener51423 ай бұрын

    Hi Grant! I'm an Industrial Engineering junior who's interested in pure math and statistics and altough I'm comfortable with their applications, I lack most of the technical knowledge and cenceptual understanding to fully absorb the essence of the notions' origins and proofs in these fields. I was surfing on the web about natural logarithms of complex numbers, which somehow lead me back to the central limit theorem and I pondered upon the very questions you examine in this video-essay. It's so refreshing to find such an expert source with a very fluid and graphic teaching method, explaining all the miniscule details that I was specifically curious of and many more like them about such sneak and elusive concepts. You're a real gem! Thank you for broadening the minds and enthusiasms of millions like me!

  • @xristosvsd7780
    @xristosvsd7780 Жыл бұрын

    magical graphs -beautiful explainations

  • @wbfaulk
    @wbfaulk Жыл бұрын

    The Unreasonable Ineffectivenss of Spell Checkers (1:04)

  • @nazir221
    @nazir2213 ай бұрын

    Listened to in Korean audio, can't understand it, but sounds sweet. Good initiative 3b1b

  • @DroCaMk3
    @DroCaMk3 Жыл бұрын

    Aside of the beautiful animations and very well-explained math, the art in this one was especially nice!

  • @florianhofmann7553
    @florianhofmann7553 Жыл бұрын

    This was beautiful - thank you!

  • @spinyslasher6586
    @spinyslasher6586 Жыл бұрын

    This is weirdly relevant for me, cause I'm doing a course on Statistical Mechanics and we're dealing with this exact problem of deriving the gaussian distribution. Thanks a lot 3b1b!

  • @whiterook6
    @whiterook6 Жыл бұрын

    I couldn't figure out how f2 turned into g * h at 14:58. Then I remembered this is probability, and that g and h are the probability of two independent events, so of course it turns into a product.

  • @smotala11

    @smotala11

    Жыл бұрын

    Haha I paused at that point too before realising.

  • @ulisses429
    @ulisses429 Жыл бұрын

    Great series!

  • @alperenerol1852
    @alperenerol18529 ай бұрын

    This brings back so much memories. I remember the first time seeing this proof in my multidimensional calculus class. I was literally blown away when I connected all the dots. It’s so neat and trivial. I just realised how fun math was back in those days.

  • @Ricocossa1
    @Ricocossa1 Жыл бұрын

    1:30 I remember when I saw for the first time that you could derive the formula for higher dimensional spheres in that way. It was in Peskin&Schroeder's book on QFT. They have this two-liner in the middle of a computation where they show that result, and I remember thinking why I'd never thought of that before.

  • @Ryuuuuuk

    @Ryuuuuuk

    Жыл бұрын

    It also pops up in introduction to statistical mechanics in the derivation of Boltzmann entropy of an ideal gas. In the microcanonical ensemble we coun't all the states that have the same energy or put otherwise are in the same shell of a multidimensional sphere. I like that this video exemplified that the Gaussian stems from radially symmetric and uncorrelated, which is just the ideal gas.

  • @brianprzezdziecki
    @brianprzezdziecki Жыл бұрын

    These videos are timeless and will be used for generations to come

  • @haoding1812
    @haoding1812 Жыл бұрын

    3b1b's video is the best video I have ever enjoyed while having lunch alone. However, I have lunch alone more often than you post videos. Either you need to make videos more often or I need to make some new friends.

  • @quocanhhbui8271
    @quocanhhbui8271 Жыл бұрын

    The art looks so great! 3B1B never disappoints.

  • @sleepycritical6950
    @sleepycritical6950 Жыл бұрын

    The artwork is really good. I hope I can one day draw like that...and also the math is beautiful too

  • @l3gacyb3ta21

    @l3gacyb3ta21

    Жыл бұрын

    Sorry to say that it’s, at least in part, ai generated

  • @sanderson84060

    @sanderson84060

    Жыл бұрын

    @@l3gacyb3ta21 Actually, it isn't. Purely human.

  • @cerocero2817

    @cerocero2817

    Жыл бұрын

    .​ @sanderson84060 What leads you to that conclsion? The description claims it was made with aid from Midjourney

  • @martincook8770
    @martincook8770 Жыл бұрын

    @3blue1brown As you’ve already talked about normal distribution, can you also talk about estimation theory (ex. maximum likelihood estimation, bayesian estimation) and hypothesis testing such as likelihood ratio test or wald test?

  • @marco_burderi
    @marco_burderi9 ай бұрын

    Grant, thanks a lot for your work. You're really just one of a kind.

  • @dsudikoff
    @dsudikoff Жыл бұрын

    Love what you do! It's great to have a mathematician ask the "Huh?" and why are these connected questions . In my studies the sense of wonder and sublime beauty of the connectedness (as well as original joy of the how of discovery by the original mathematicians) was wrung out of the process. You ask the "meta" questions!

  • @brunoheblingvieira5141
    @brunoheblingvieira5141 Жыл бұрын

    Very nice video, just one point (which I guess most know, but still) about Maxwell's equations: while Maxwell derived the laws, it was Heaviside who later wrote the equations. Maxwell didn't have Vector Calculus, so he had tens of equations for the electromagnetic phenomena. Heaviside was able to summarize them all into the four we know with his (independent) discovery of Vector Calculus principles.

  • @cycletofun5964
    @cycletofun5964 Жыл бұрын

    Great video! Can you do a video on Bessel's correction and "degrees of freedom" in statistics in general?

  • @justpaulo
    @justpaulo Жыл бұрын

    Beautiful artwork !

  • @artforster4759
    @artforster4759 Жыл бұрын

    Excellent and informative video! Thank you! I like your use of the Galton Board beads (which are independent of each other) as a dynamic way to illustrate adding together many different independent variables to produce a normal distribution via the IID CLT.

  • @josgibbons6777
    @josgibbons6777 Жыл бұрын

    This matches Chapter 7.2 of Probability Theory: The Logic of Science by E T Jaynes. The chapter provides several motivations of Gaussians. So if anyone wants to anticipate the next video, I recommend reading it.

  • @davidhill5798
    @davidhill5798 Жыл бұрын

    My compliments to the artist and the inspiration to use their beautiful watercolors to merge abstract mathematics and humanity. Beautiful artwork and wonderfully complimentary to the elegant graphics and insights.

  • @abidatufail3185

    @abidatufail3185

    Жыл бұрын

    I don't know if you have read the description, seems like it was mostly Ai generated, which isn't a bad thing but seems things are changing bit too fast

  • @Axel_Ragnarsson
    @Axel_Ragnarsson Жыл бұрын

    Beautiful artistry! Well done

  • @firmkillernate
    @firmkillernate9 ай бұрын

    Learning calculus has definitely influenced and changed my life. Thanks for the deep dive on one of my most inspirational problems in mathematics!

  • @christopherryzowicz6684
    @christopherryzowicz6684 Жыл бұрын

    Grant, you should do a video about the new proof that 2 high schoolers came up with for the Pythagorean Theorem! It’s in the news, easy to find and a great discover for to young mathematicians.