## Search found 81 matches

- Mon Aug 24, 2009 12:04 am UTC
- Forum: Science
- Topic: Life expectancy of scientists
- Replies:
**32** - Views:
**5851**

### Re: Life expectancy of scientists

As far as insane mathematicians go, who can forget Georg Cantor? Poor man, he should never have played with infinity...

- Tue Aug 18, 2009 11:27 pm UTC
- Forum: Mathematics
- Topic: Sudoku algebra
- Replies:
**11** - Views:
**2098**

- Sun Aug 16, 2009 1:42 am UTC
- Forum: Science
- Topic: iodine + methylene blue
- Replies:
**2** - Views:
**1465**

### Re: iodine + methylene blue

interesting, i figured it had something to do with methylene blue's aromaticity... i would be curious to find out if adding iodine directly to MB would produce the same effect. also, when it was heated, although the gold color was gone, there was still some kind of membrane between the oil/iodine so...

- Sun Aug 09, 2009 3:18 am UTC
- Forum: Science
- Topic: iodine + methylene blue
- Replies:
**2** - Views:
**1465**

### iodine + methylene blue

some time ago i was playing with potassium iodide and an aqueous solution of methylene blue. i dissolved elemental iodine in mineral oil by pouring mineral oil to a vial of KI, adding bleach (NaClO), and shaking until the mineral oil turned violet. when i poured the mineral oil/iodine solution into ...

- Sun Aug 09, 2009 3:03 am UTC
- Forum: Science
- Topic: Blue alchopop loses colour
- Replies:
**5** - Views:
**1547**

### Re: Blue alchopop loses colour

my guess would be that the blue pigment decomposes in exposure to sunlight.

- Fri Jul 17, 2009 12:35 am UTC
- Forum: Science
- Topic: What are these CG pictures from nasa?
- Replies:
**4** - Views:
**1226**

### Re: What are these CG pictures from nasa?

Geez, that's a lot of IFS!

- Fri Jul 17, 2009 12:11 am UTC
- Forum: Science
- Topic: Neutrino Mass
- Replies:
**10** - Views:
**1476**

### Re: Neutrino Mass

Yay redshift! or blueshift, depending on your political alignment. A greenshifted photon will probably never win a major election...

- Sun Jul 12, 2009 2:59 am UTC
- Forum: Mathematics
- Topic: Four Color Problem
- Replies:
**3** - Views:
**761**

### Re: Four Color Problem

it wasn't wikipedia that told me that, it was a book that i just bought. has a nice proof still not been found for the four color problem?

- Sun Jul 12, 2009 2:17 am UTC
- Forum: Mathematics
- Topic: Boundary Optimization
- Replies:
**16** - Views:
**1333**

### Re: Boundary Optimization

i don't have a solution either, but i assume you would want to trace a circle? that should be the minimum surface to enclose the maximum area.

- Sun Jul 12, 2009 2:10 am UTC
- Forum: Science
- Topic: Neutrino Mass
- Replies:
**10** - Views:
**1476**

### Re: Neutrino Mass

because the photons aren't changing from one type of photon to another. in fact a photon, as a particle, doesn't have a frequency; it has a particular energy which, in terms of waves, can best be described as a frequency. wave-particle duality can be confusing...

- Sun Jul 12, 2009 1:48 am UTC
- Forum: Mathematics
- Topic: Four Color Problem
- Replies:
**3** - Views:
**761**

### Four Color Problem

is it just a coincidence that the value of Heawood's formula (C=int[(7+sqrt(1+48h))] , where h is the order of a surface and C is the number of colors necessary) when h=0 is 4, even though the formula is intended only for h>0?

- Fri Jul 10, 2009 3:08 am UTC
- Forum: Science
- Topic: Insider Science Jokes/Lingo
- Replies:
**129** - Views:
**28824**

### Re: Insider Science Jokes/Lingo

I built HAMMERTIME in ballview and ran some quick energy minimizations. it seems to fold rather nicely

- Fri Jul 10, 2009 2:50 am UTC
- Forum: Science
- Topic: How do OLEDs work?
- Replies:
**13** - Views:
**1629**

### Re: How do OLEDs work?

The organic molecules must be conjugated polymers, mustn't they?

- Fri Jul 10, 2009 2:34 am UTC
- Forum: Mathematics
- Topic: Euler's Formula.
- Replies:
**4** - Views:
**1010**

### Re: Euler's Formula.

I'm a high school student as well and had the same questions. the answer is yes. sin(z)=-\frac{i\,\left( {e}^{i\,z}-{e}^{-i\,z}\right) }{2} cos(z)=\frac{{e}^{i\,z}+{e}^{-i\,z}}{2} solve tan(z)=\frac{sin(z)}{cos(z)} to get tan(z)=-\frac{i\,\left...

- Tue Jul 07, 2009 1:50 am UTC
- Forum: Science
- Topic: Force of a raindrop
- Replies:
**17** - Views:
**7627**

### Re: Force of a raindrop

i'm sorry, i just remembered reading in a book somewhere that raindrops flattened out considerably as they fell.

- Mon Jul 06, 2009 12:41 am UTC
- Forum: Science
- Topic: Force of a raindrop
- Replies:
**17** - Views:
**7627**

### Re: Force of a raindrop

but a falling raindrop is not a sphere: it flattened out considerably by air resistance so that it is actually more like a disk. isn't air resistance important for such a light object?

- Tue Jun 16, 2009 6:27 pm UTC
- Forum: Science
- Topic: Physics 101
- Replies:
**1** - Views:
**506**

### Physics 101

I am trying to prep a friend for his physics course this fall. what math should he be expected to know for a physics 101 course?

- Tue Jun 16, 2009 3:32 am UTC
- Forum: Science
- Topic: Fungal Parasites! (Help please?)
- Replies:
**28** - Views:
**2305**

### Re: Fungal Parasites! (Help please?)

just as far as dramatic effect is concerned, even though having the fruiting body burst forth from the eye sockets is more gruesome, would it not be more dramatic to have it emerge from the victim's spinal column, just like the ant in the picture? i can imagine a person lying on the ground, undergoi...

- Wed Jun 03, 2009 12:55 am UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Re: Curve Question

How do you iterate functions and stuff in maxima? i can't figure it out.

- Tue Jun 02, 2009 2:27 am UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Re: Curve Question

Right, but it explains why the graph tends to twist inwards after each iteration. It's mad-crazy stretching of the unit interval!

- Tue Jun 02, 2009 2:20 am UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Re: Curve Question

Wait, shouldn't any positive, imaginary value send it shooting toward the origin? I see what you're saying though, I had thought of that, the thought just didn't connect fully

- Tue Jun 02, 2009 2:09 am UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Re: Curve Question

Ah... well, er, yes? Wait, no. Good point. I guess that means that one could do a complex mapping of the Mandelbrot sort of this function, though i don't know if the basin of convergence will be a fractal or not. Any easy way to find out?

- Tue Jun 02, 2009 1:50 am UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Re: Curve Question

crap, i guess there's no way for me to analyze this, then. Here are some of the iterations of that first function for [0,1) :

**Spoiler:**

- Tue Jun 02, 2009 12:49 am UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Re: Curve Question

Is there any counterpart to the cobweb plot in the complex plane?

- Tue Jun 02, 2009 12:43 am UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Re: Curve Question

But x and x squared don't draw the same curve on the complex plane. I guess it isn't strange in the sense that the iterations of sin(x) differ in form from sin(2x), the latter is also more prone to becoming chaotic, if i recall correctly. To me, the strange thing is how much the iterations of {e}^{2...

- Tue Jun 02, 2009 12:26 am UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Re: Curve Question

I was wondering if iterating it would yield a fractal mapping, but since my free trial for ultrafractal has expired I'm not sure if I'll ever find out Strangely, the iterations of this curve are different than iterations of [imath]e^{i\ x}[/imath] over [imath][0,2\pi)[/imath]...

- Mon Jun 01, 2009 11:26 pm UTC
- Forum: Mathematics
- Topic: Curve Question
- Replies:
**15** - Views:
**1315**

### Curve Question

Given f(x) ={e}^{2\pi\,i\ x} over the interval [0,1), (the unit circle on the complex plane), what are the names for the curves (f \circ f)(x) and (f \circ f \circ f)(x) ? Is there any general name for curves of the family f^n (x) ? What happens as n \...

- Mon Jun 01, 2009 10:57 pm UTC
- Forum: Science
- Topic: Comical mistakes in your homework.
- Replies:
**144** - Views:
**17298**

### Re: Comical mistakes in your homework.

The errors resulting in negative solutions etc. remind me of the the paper "Endochronic Properties of Resublimated Thiotimoline"

- Sun May 31, 2009 8:16 pm UTC
- Forum: Science
- Topic: Can a massive whip approach the speed of light?
- Replies:
**7** - Views:
**2108**

- Fri May 29, 2009 2:01 am UTC
- Forum: Mathematics
- Topic: Strange Attractor
- Replies:
**0** - Views:
**528**

### Strange Attractor

does the point [imath]({U}_{k},{V}_{k})[/imath] where [math]{U}_{n}={sin\left( \frac{n}{\pi}\right) }^{\frac{1}{3}}\,{cos\left( {U}_{n-1}\right) }^{\frac{1}{3}}+sin\left( n\right)[/math]

[math]{V}_{n}=sin\left( {V}_{n-1}\right) +cos\left( n\right)[/math]

lie on a strange attractor?

[math]{V}_{n}=sin\left( {V}_{n-1}\right) +cos\left( n\right)[/math]

lie on a strange attractor?

- Fri May 29, 2009 1:41 am UTC
- Forum: Mathematics
- Topic: Kleinian Groups
- Replies:
**4** - Views:
**668**

### Re: Kleinian Groups

was the projective plane in widespread use in the 1960's? If not, it's the ordinary complex plane.

- Wed May 27, 2009 3:03 am UTC
- Forum: Science
- Topic: Properties of Sentience
- Replies:
**28** - Views:
**3812**

### Re: Properties of Sentience

'twas cockatoo. But to be fair, having a non-sentient creature that does respond to music doesn't imply the converse - that a sentient creature can be non-responsive to music. That is very true, though i'll admit that it would require an auditorily based organism for it to come about at all. FYI, by...

- Wed May 27, 2009 2:59 am UTC
- Forum: Books
- Topic: special topics in calamity physics
- Replies:
**3** - Views:
**1324**

### special topics in calamity physics

Who's read it? I think it's fucking awesome.

- Wed May 27, 2009 2:57 am UTC
- Forum: Music
- Topic: Drummers in bands (suck)
- Replies:
**79** - Views:
**8446**

### Re: Drummers in bands (suck)

I happen to like Pink Floyd's drummer (i forget his name). A lot. Particularly when the drums come in at the beginning of Dark Side of the Moon ("Speak to Me") and after the intro to the first chunk of "Shine on You Crazy Diamond." I hope somebody out there knows what I'm talking...

- Wed May 27, 2009 2:49 am UTC
- Forum: Books
- Topic: Catcher in the Rye stinks or is it just me?
- Replies:
**70** - Views:
**13534**

### Re: Catcher in the Rye stinks or is it just me?

I found Holden psychologically interesting. He is obnoxious and stubborn but is in reality a fairly complex character. I can understand why someone could dislike it but there are worse books.

- Wed May 27, 2009 2:15 am UTC
- Forum: Science
- Topic: Properties of Sentience
- Replies:
**28** - Views:
**3812**

### Re: Properties of Sentience

Besides, there's that parrot that has learned to dance to the rhythm of music so obviously our pattern recognition isn't unique.

- Wed May 27, 2009 1:56 am UTC
- Forum: Science
- Topic: What is the hottest possible temperature?
- Replies:
**28** - Views:
**14179**

### Re: What is the hottest possible temperature?

what of the plank temperature?

- Wed May 27, 2009 1:55 am UTC
- Forum: Science
- Topic: Properties of Sentience
- Replies:
**28** - Views:
**3812**

### Re: Properties of Sentience

Then doesn't it stand to reason that some other organism would find it's neural (or whatever) circuits tickled in a similar way by some kind of stimulus?

- Tue May 26, 2009 8:11 pm UTC
- Forum: Mathematics
- Topic: Kleinian Groups
- Replies:
**4** - Views:
**668**

### Re: Kleinian Groups

I had already been to all of those sites and they just told me what i already knew: that it is a set of mobius transformations.

- Tue May 26, 2009 2:43 am UTC
- Forum: Science
- Topic: Most geeky thing you've done recently.
- Replies:
**133** - Views:
**50145**