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  • - I've been fascinated with savants, mathematical savants.

  • There was a guy I was looking at,

  • young guy, 12-year-old from the United States

  • called Jacob "Jake" Barnett.

  • Actually, he did this thing on 60 Minutes

  • where he visualized numbers.

  • - What does six look like?

  • - Six, that's like

  • the edge points of that.

  • - So in this report, Jacob "Jake" Barnett

  • was showing how much of a genius he is.

  • And he actually showed a way that he visualizes numbers that's different.

  • I've never seen it before.

  • And the reporter didn't go into any detail.

  • He just said, "And this is how he sees 54."

  • But that wasn't enough for me

  • 'cause I downloaded to the HD, download 1080p,

  • and I wanted to see it, so I blew it up

  • and just with that information,

  • just that picture and the number, I worked out what he'd done.

  • - This is when I do basic stuff.

  • This is 2 times 27, also known as 54.

  • - [Simon] Let's start with the number three.

  • How does he visualize three?

  • Here it is.

  • So why is it a triangle, Brady?

  • - [Brady] (laughs) Because it has three sides?

  • - [Simon] (laughs) It does have three sides.

  • But he's not interested in the sides Brady,

  • he's interested in the points.

  • So, one, two, three. Now, that's really important.

  • What about three times two?

  • So three times two is six.

  • So you might think three times two, six, hexagon.

  • Okay? But no.

  • And there's a reason why.

  • It's because a hexagon, six, six is not a prime number.

  • Primes are important to mathematicians,

  • so he wants to keep the primes.

  • Now, he wants to keep it, so what he does,

  • he actually puts a triangle on top of another triangle.

  • One, two, three, four, five, six.

  • So, let's keep going.

  • What about three times three?

  • All right.

  • So again, he starts with a triangle.

  • It happens to be red.

  • I don't know whether that was important or not.

  • Three times three, he doesn't put three triangles

  • on top of one another.

  • No, no, no.

  • Three times three, he puts triangles on the ends.

  • So that's why the ends, the vertices, are important.

  • So we've got one, two, three, four, five,

  • six, seven, eight, nine.

  • One, two, three, four, five, six, seven, eight, nine.

  • That's nine.

  • Okay, next time what we're gonna do is we're gonna try times three again.

  • So, now we've got three times three times three,

  • nine, three is twenty-seven.

  • You should cotton on to how he does this now.

  • He puts triangles on the edges.

  • Check that out.

  • Triangle, triangle,

  • triangle, triangle.

  • So now there's one, two, three, four five, six, seven, eight, nine.

  • Nine, eighteen, twenty-seven.

  • But the reason why I understood this is because this is called...

  • What he's doing is prime decomposition.

  • So the fact is, the integers, the whole numbers,

  • you can write any whole number in its atomic form, which is primes.

  • - [Brady] This is like factorization.

  • - Exactly.

  • - This is 2 times 27, also known as 54.

  • - [Simon] So this is for the 60 Minutes report.

  • Two times three times three times three.

  • Okay?

  • So this is what he did.

  • If it's this times two,

  • well, it's pretty obviously what needs to happen.

  • We need to go uh, uh, uh.

  • And then you need to go uh, uh, uh.

  • Uh, uh, uh.

  • Uh, uh, uh.

  • Mm, mm, mm.

  • Mm, mm, mm.

  • And then you need to go mm, mm, mm, mm, mm, mm.

  • So that's it.

  • - [Brady] That's 54.

  • - [Simon] That's 54; there's 54 points.

  • So what's really good about this, better than just having 54,

  • is the fact that you can look into the number,

  • which is pretty cool 'cause you can look at it

  • and if you were shown a number, you can go,

  • "Oh, I know what this number contains."

  • It contains three, it's divisible by three,

  • not once 'cause there's another smaller triangle,

  • so it's divisible by three by three.

  • And there's another smaller triangle again,

  • so it's divisible by three by three by three.

  • So it's like an X-ray.

  • The only problem is

  • you don't know what the number is just by looking at it readily.

  • Like, I could put my pin number down

  • and I think it'd be quite safe

  • unless you paused it and worked it out.

  • But if I just flashed it, you wouldn't know what it is.

  • I don't know how it helps him.

  • I think, the thing I got out of it was the fact that, here's someone

  • who's not afraid to reimagine mathematics.

  • 'Cause we get taught maths a certain way.

  • We get taught maths a specific way, base 10,

  • based on the fact that we've got these, okay?

  • And that's not math,

  • that's just one way of seeing maths.

  • And so, this is great because it's like,

  • it's intuitive, it's imaginative.

  • He's come up with it his own way.

  • Sure, this is like...

  • I saw the link to what we say is, you know, accepted mathematics.

  • Prime factorization of integers, accepted way.

  • But I mean, this is wonderful.

  • And for me, I got to kind of try and understand

  • this kid, this savant, who's gonna go on

  • and do amazing things.

  • He's gonna do amazing things.

  • And look, here he is

  • taking what we get taught at school

  • and having fun with it.

  • - [Brady] Thanks to the Great Courses Plus

  • for supporting this video.

  • If you fancy enjoying your very own online university,

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  • of lectures and lessons from world-class professors?

  • There are thousands and thousands of videos

  • covering all topics from history to photography.

  • - We'll learn some of the mathematics behind the Rubik's Cube.

  • - [Brady] And well, you won't be surprised to know

  • that some of my favorites are the ones

  • about mathematics and numbers.

  • Just this week I've been watching one called the joy of primes,

  • and I've learned a few new things.

  • I really recommend it.

  • Plans for the Great Courses Plus start at $14.99 a month,

  • but you can start a free one-month trial

  • by going to the TheGreatCoursesPlus.com/numberphile.

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  • or you can click on the link in the video description.

  • No tests, no homework, watch at your own pace.

  • And our thanks to them for supporting this video.

- I've been fascinated with savants, mathematical savants.

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数字を形として想像する - Numberphile (Imagining Numbers as Shapes - Numberphile)

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    林宜悉 に公開 2021 年 01 月 14 日
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