Name: タウvsパイのスマックダウン - Numberphile (Tau vs Pi Smackdown - Numberphile)
Uploaded: 2021-01-14T05:35:48.000Z
Duration: 11 min 12 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

And I think we should stop using pi and start using tau.

And I think Steve said something ridiculous.

And even if this was an equal race, we would've been using

Or even if tau had been established first, I'm still

STEVE MOULD: Let's think of a reasonable definition of what

And if you're ever doing maths using circles, you talk about

All your equations about circles talk about the radius.

Unless you're an engineer, you use diameter.

But as a mathematician, you use the radius.

The circle constant should surely be defined in terms of

So the circle constant should be the circumference divided

STEVE MOULD: And so we're not saying let's redefine pi and

Instead, we're saying that's going to be confusing, so

MATT PARKER: To be honest, one of the points was quite nice,

which is that if you're an engineer, you use pi.

And in fact, historically, we've used pi because when you

measure a circle, the only direct measurement you can

MATT PARKER: And so that's why historically we've done that.

And to this day in precision engineering we do that.

And yes, you can do some very nice maths with

People say, oh, but we have to put 2 pi into lots of

There are as many fantastic equations out there which use

MATT PARKER: And so I see Steve is holding a pen.

MATT PARKER: So everyone's classic is the e to the i pi

job, where e to the i pi plus 1 equals 0.

MATT PARKER: And that is using a solitary pi

this is a nice one-- that equals pi squared--

MATT PARKER: --outside the major radius squared minus the

STEVE MOULD: What-- yeah, absolutely-- tau squared on 4.

OK, let's just say that Matt has cherry-picked a couple of

Two things I'd say-- let's look at, for example, the area

So we're looking at the area pi r squared.

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タウvsパイのスマックダウン - Numberphile (Tau vs Pi Smackdown - Numberphile)

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