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/sci/ - Science & Math

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1535342 No.1535342 [Reply] [Original]

Can a perfect circle ever exist anywhere but in our heads?

>> No.1535350

Why not?

>> No.1535371

Well I imagine you could get pretty close, but could you ever find a circle, measure the diameter and circumference, take their ratio and get pi?

>> No.1535374

>>1535371
Seeing as pi is transcedental, no.

>> No.1535383

>>1535350

The world isn't made of lines, squares or circles; It's made of points.

It is impossible to generate perfect curves in reality with only points and lines between them. You can get close, but never perfect.

>> No.1535388

a photon or some other fermion perhaps

>> No.1535396

Question guys.

Would a ball of a superfluid (no viscosity, no friction) in a vacuum that is held together solely by its own gravity be a perfect sphere?

>> No.1535399

>>1535396

I'm kinda thinking of this
http://www.youtube.com/watch?v=BxyfiBGCwhQ
but with no movement and no other external force acting on it.

>> No.1535407

>>1535399
I don't think so, since you only have a finite amount of atoms.

>> No.1535411

>>1535396
IS Jupiter a perfect sphere?

>> No.1535413

>>1535396
No, atoms move. Perfect circles cannot exist outside of mathematics.

>> No.1535414

Define "existing".

>> No.1535425

Can a perfect circle exist?

Sure.
Step 1: Imagine a point.
Step 2: imagine all points on some arbitrary plane some arbitrary distance away from that point.
Step 3: ???
Step 4: CIRCLE!

Were you asking if you can draw a perfect circle? No, you can't.

>> No.1535447

>>1535425
Depends on your definition of perfect. Perfect macroscopically, or perfect transcendentally?

>> No.1535470
File: 29 KB, 589x589, Titan_in_natural_color_Cassini.jpg [View same] [iqdb] [saucenao] [google]
1535470

Any world with an atmosphere that is both dense and opaque, like Titan, should essentially be a perfect circle when you're looking at it from space (if you're looking at the part of the planet that faces its star, the star being directly behind you). Most planets with an atmosphere should also appear to be perfect spheres.

>> No.1535478

>>1535470
>appear

>> No.1535492

The atmosphere is roughly a perfect sphere, but isn't. The terrain of the planet be bumpy.

>> No.1535497

A perfect circle is incredibly simple to create on anything that can display text.

BEHOLD, THE PERFECT CIRCLE: x²+y²=r²

>> No.1535502

PROTIP: math is useless until implied

>> No.1535505

>>1535497
But now the circle appears in my mind, not on the screen like you said.

>> No.1535524
File: 14 KB, 500x303, pic_morpheus.jpg [View same] [iqdb] [saucenao] [google]
1535524

>>1535505
Your mind... makes it real.

>> No.1535616 [DELETED] 
File: 755 KB, 516x613, 1271476428205.png [View same] [iqdb] [saucenao] [google]
1535616

as my masters course is actually an undergraduate course, I will be moving onto my P.H.D next.

>> No.1535614

>>1535505

That doesn't make it not still on the screen, though.

>> No.1535638

>>1535502
>math

>> No.1535683

>>1535502
>PROTIP: math is useless until implied
>implied
>implied
The anon who posted this is either really clever or a total douchenut. I'm pissed I can't tell which.

>> No.1535707

>>1535683
Yeah, I couldn't detect the sarcasm either, so I just forgot about it until you brought it up.

>> No.1535708
File: 2.08 MB, 716x1092, 1280793315755.png [View same] [iqdb] [saucenao] [google]
1535708