CocoaNutCakery wrote:Te sheer level of militant atheism in this thread is absurd.

And there's another phrase that you can safely ignore!

- Fri Jul 19, 2013 4:12 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1240: "Quantum Mechanics"
- Replies:
**201** - Views:
**46296**

CocoaNutCakery wrote:Te sheer level of militant atheism in this thread is absurd.

And there's another phrase that you can safely ignore!

- Mon Oct 31, 2011 1:03 am UTC
- Forum: Mathematics
- Topic: Average circle intersection - an integral
- Replies:
**12** - Views:
**2295**

Make sure you weight it. There isn't an equal probability of x=0.1 and x=0.9, the latter is much more likely. Never mind, you did that. Those are both pretty complicated, but wolfram alpha will work them out for you (click show steps if they aren't already expanded): First term: http://www3.wolframa...

- Sat Oct 29, 2011 10:25 pm UTC
- Forum: Coding
- Topic: Need help with simple program.
- Replies:
**7** - Views:
**1965**

Try sprintf(). That's certainly the "basics".

- Fri Sep 30, 2011 4:51 am UTC
- Forum: Hardware
- Topic: What's the Big Deal with Alienware®?
- Replies:
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**10878**

A research lab I work in recently bought an alienware laptop for basically a portable 3D/LabVIEW/Haptics rig. I offered a very similar rig for a fraction of the price, and was overruled because of the Alienware accidental damage protection, which no one else is crazy enough to offer (and apparently ...

- Fri Sep 23, 2011 6:22 pm UTC
- Forum: Science
- Topic: Well, this could change things (neutrinos)
- Replies:
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They KNOW they haven't disproved physics. In SN1987A, a pulse of neutrinos arrived several hours before the light was detected. SN1987A is located 168,000 light years from Earth. If neutrinos travel at 40,001c/40,000, then the neutrinos from SN1987A should have arrived 4 years before they did. Your...

- Fri Jul 29, 2011 4:21 am UTC
- Forum: Mathematics
- Topic: 4 color theorem with multiple regions
- Replies:
**12** - Views:
**2061**

This may be a bit off-topic, but is there a generalization for maps on manifolds other that a sphere? No. Some specific cases can be made. For example, a map on a sphere can be transformed to a map on a plane, and so it will take at most four colors in either case. A torus, however, will require 7....

- Sat May 28, 2011 3:23 am UTC
- Forum: Mathematics
- Topic: A criminal hides in a room with 99 innocent people...
- Replies:
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**4526**

I followed all the probability here so far, but I'm not sure what to make of this: What if, instead of gathering the evidence before making rash decisions, we decide to have a good old-fashioned witch hunt, test people until we get a positive, and then burn that person at the stake. What is the prob...

- Thu May 26, 2011 4:19 am UTC
- Forum: School
- Topic: Saying "gay" is now illegal at school?
- Replies:
**6** - Views:
**4289**

Are we actually going to be calling it "bulling" now? Because thats...cows...and not for children...

- Mon May 23, 2011 2:47 am UTC
- Forum: Mathematics
- Topic: alternative mathematics
- Replies:
**128** - Views:
**15415**

My reactions to this thread: Oh, its this guy again... From this and his previous thread, he seems to have poor English and is using diagrams to communicate worse Fixed that for you. I've heard rumours of a math professor that once proved something significant and then went mad and keeps posting ab...

- Sun May 22, 2011 10:28 pm UTC
- Forum: Science
- Topic: colour of the sky
- Replies:
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**9854**

To bed pedantic, it isn't exactly correct. The Sun is not white. It isn't nearly hot enough at its surface. Yellow is what you have left over when you remove blue from white, but the Sun still emits plenty of blue anyway, just not enough to fully balance the lower wavelengths. Of course the sun is ...

- Wed May 11, 2011 7:00 pm UTC
- Forum: Coding
- Topic: PHP Encryption Class - Any flaws?
- Replies:
**6** - Views:
**3093**

And to nitpick: That's what a for loop is for :wink: I know, but I wanted it to always run at least once (something a for loop doesn't do). Sure, with it now it will always run 5000 times, but if someone edited the code and reduced that number to 0, it would still run once. I don't know much about ...

- Wed May 11, 2011 6:35 pm UTC
- Forum: Mathematics
- Topic: Formal mathematical definition of area
- Replies:
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**2307**

That would be the integral of the prepositional function, taken to have value 0 outside the shape, and 1 inside, over the plane. Of course, no one uses this in practice. Far more useful would be to have a function that gives the border of the shape. If the boundary (which is defined as the set of po...

- Tue May 10, 2011 2:08 pm UTC
- Forum: Coding
- Topic: Macro Ethics
- Replies:
**17** - Views:
**2976**

WarDaft wrote:Yakk wrote:I want strong static Hindley–Milner ducktyping! Quack.

So, basically, Haskell?

There are ducks in Haskell?

Great, another language to learn.

- Sun Apr 24, 2011 3:06 am UTC
- Forum: Science
- Topic: Unification of forces in early universe
- Replies:
**13** - Views:
**2894**

So, there's a field description and a particle description of both weak and EM. If you want to talk about weak in terms of W+, W- and Z, then you should compare to the chatter about EM in terms of photons. They are analogous. Ok, I understand what you mean there, so it's time for some more reading....

- Sun Apr 24, 2011 2:39 am UTC
- Forum: Science
- Topic: Unification of forces in early universe
- Replies:
**13** - Views:
**2894**

I am an Actual Physicist! The gravitational and em forces very much do not have scalar potentials. The potential for electromagnetism is the 4-vector A. Alternatively, you can consider it to be a 1-form. The differential forms version of e&m is much neater. Then, the field strength tensor is F=...

- Sun Apr 24, 2011 2:21 am UTC
- Forum: Coding
- Topic: Python question
- Replies:
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**1855**

No, you need to check that the evaluation process doesn't do anything bad, step by step. E.g. you don't want to eval shutil.rmtree('/') ; that would be bad. Okay, I'll take your word for it. another related question: I got the initial question answered and I wanted to make a function that will tell...

- Sun Apr 24, 2011 1:41 am UTC
- Forum: Science
- Topic: Unification of forces in early universe
- Replies:
**13** - Views:
**2894**

I'm going to chime in and hope that an Actual Physicist can clear some things up for me on a similar topic. See, the gravitational and electromagnetic forces appear to be described by a scalar potential field. The gradient of this is a vector field, and this multiplied by a relevant 'charge' (mass o...

- Wed Mar 23, 2011 5:49 am UTC
- Forum: Coding
- Topic: Perl problem, change PP: first occurrence to HL:
- Replies:
**16** - Views:
**2118**

You could do it with a single regex replacement by: $filename = "input.txt"; open (FILE,"<$filename"); @fileinput=<FILE>; $fileinput=join("\n", @fileinput); $fileinput=~s/PP:/HL:/; which will only change the first PP: it finds to HL:, as your example says. You can, inci...

- Wed Jan 19, 2011 5:07 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0849: "Complex Conjugate"
- Replies:
**96** - Views:
**24864**

Google it.

Alternately, if you have a complex number a+bi, the complex conjugate is a-bi. So, multiplying these together gives (a^2+abi-abi-b^2*i*2)=(a^2+b^2). Which, as you'll note, happens to be real.

Therefore, shit just got real.

Alternately, if you have a complex number a+bi, the complex conjugate is a-bi. So, multiplying these together gives (a^2+abi-abi-b^2*i*2)=(a^2+b^2). Which, as you'll note, happens to be real.

Therefore, shit just got real.

- Thu Jan 13, 2011 4:51 am UTC
- Forum: School
- Topic: Looking for good textbooks on critical thinking
- Replies:
**21** - Views:
**3655**

Science. All of science.

- Sun Jan 09, 2011 5:01 am UTC
- Forum: Coding
- Topic: C compiler for the PIC16 series microcontroller
- Replies:
**7** - Views:
**1844**

You mean like this: http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en542849 The free version works fine, the paid version has better optimization. I TA a class where we throw a PIC chip and this compiler at a bunch of freshmen and tell them to do somethi...

- Fri Jan 07, 2011 6:50 am UTC
- Forum: Science
- Topic: Aluminum foil in a microwave - when should you be worried?
- Replies:
**24** - Views:
**14151**

Sparks mean some sort of electrical discharge, which probably means something is going to get oxidized and that looks ugly. It can also probably damage the metal in the front door, which as we all know is the thing that protects you from being cooked. In addition, covering your food entirely in foil...

- Tue Jul 06, 2010 2:24 pm UTC
- Forum: Mathematics
- Topic: Poincare Conjecture Solved (seriously)
- Replies:
**2** - Views:
**935**

- Sun Sep 27, 2009 5:18 am UTC
- Forum: Science
- Topic: Electric field inside a hollow sphere
- Replies:
**7** - Views:
**9909**

Question was copied n pasted.

So could perhaps the charges redistribute? By my calculations, that's a total charge of 8.042*10^-9 C over a volume of 3.28*10^-3 m^3 for charge density of 2.45*10^-6 C/m^3...which leads to lots of calculus which we aren't supposed to have to do...

So could perhaps the charges redistribute? By my calculations, that's a total charge of 8.042*10^-9 C over a volume of 3.28*10^-3 m^3 for charge density of 2.45*10^-6 C/m^3...which leads to lots of calculus which we aren't supposed to have to do...

- Sun Sep 27, 2009 4:29 am UTC
- Forum: Science
- Topic: Electric field inside a hollow sphere
- Replies:
**7** - Views:
**9909**

So I'm having trouble conceptually understanding this problem: A hollow metal sphere has 6 cm and 10 cm inner and outer radii, respectively. The surface charge density on the inside surface is -100nC/m^2. The surface charge density on the exterior surface is +100nC/m^2. Find the strength and directi...

- Thu Sep 24, 2009 4:14 am UTC
- Forum: Science
- Topic: Diluting 18M Sulfuric acid to 6M in a volumetric flask?
- Replies:
**23** - Views:
**6221**

I'm pretty sure it's the other way around. Say it in an accent so 'waata' rhymes with 'oughta'.

And by pretty sure, I mean absolutely sure. That way water splashes on you and you get wet rather than acid splashes on you and you get burned.

And by pretty sure, I mean absolutely sure. That way water splashes on you and you get wet rather than acid splashes on you and you get burned.

- Sun Aug 30, 2009 6:15 am UTC
- Forum: Science
- Topic: Faster Than Light Theory
- Replies:
**18** - Views:
**1512**

Gravity isn't just there. Gravity is expected to propagate at the speed of light. This invalidates the remainder of your idea. Even if we could determine the gravitational force vector at a single location, we wouldn't be able to use this to detect the positions of atoms. There are too many variable...

- Fri Jul 31, 2009 4:03 am UTC
- Forum: Mathematics
- Topic: calculator stupidity
- Replies:
**3** - Views:
**932**

Oh, is it? I always figured it used radians for some part of the calculation, but never got why it couldn't use degrees as well. Now. I always liked wolfram alpha simply because it's able to take a decimal and tell me what that number actually IS, like entering 1.5708 gives you pi/2. It also stumble...

- Fri Jul 31, 2009 3:46 am UTC
- Forum: Mathematics
- Topic: calculator stupidity
- Replies:
**3** - Views:
**932**

I don't think I've ever seen a topic on this, and I tried a few searches... Have any of you seen an example where a calculator's simplification system just breaks down? I was doing physics earlier, something about vector addition in cylindrical form, on my TI-89, and got the following as the magnitu...

- Sat May 23, 2009 5:32 pm UTC
- Forum: Mathematics
- Topic: New Mathematical Operation: Swagger
- Replies:
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Swagger's domain is when x is inside reality maybe? Which leads to my next question: Anyone have any idea how swagger would deal with imaginary numbers? How about equations with variables? To answer this question, you need to give this "operation" some sort of meaning or context. It has a...

- Wed May 06, 2009 6:12 pm UTC
- Forum: Mathematics
- Topic: AP Calc BC 2009
- Replies:
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So, the exam. It was I think far harder than I expected, and there was a significant amount of material I hadn't seen before. Actual question included for context but spoilered because we're not supposed to talk about it...I'm sure I got some details wrong anyway... One question gave us the taylor s...

- Sun Apr 12, 2009 12:52 pm UTC
- Forum: Mathematics
- Topic: The MOST comprehensive math reference poster one can purchas
- Replies:
**18** - Views:
**2741**

EDIT: almost forgot my favorite: http://imgur.com/IQ0S6.jpg What's that supposed to be? It seems to be a picture of science. What significance do the lines and dots have? Why do some fields have more or less lines or dots than others? I would imagine that the colored dots are subfields, identified ...

- Sat Apr 04, 2009 8:35 pm UTC
- Forum: Coding
- Topic: xkcd coding contest #2: NOPscotch
- Replies:
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**6135**

Well done to entropy!

I'm considering various enhancements, but at this point my code is mostly brute force and very little enhancement. .

I have checked and found that every square is reachable via some combination of moves. So 703 is still the upper bound.

I'm considering various enhancements, but at this point my code is mostly brute force and very little enhancement. .

I have checked and found that every square is reachable via some combination of moves. So 703 is still the upper bound.

- Sat Apr 04, 2009 4:32 pm UTC
- Forum: Coding
- Topic: xkcd coding contest #2: NOPscotch
- Replies:
**87** - Views:
**6135**

Emu: Yep. I can also give you a solution to the sample 8x7 grid, if you'd like to test your algorithm. I don't think a solution has been posted yet.

- Sat Apr 04, 2009 4:20 pm UTC
- Forum: Coding
- Topic: xkcd coding contest #2: NOPscotch
- Replies:
**87** - Views:
**6135**

I have 621 with random jumps, I think, using the path with the md5sum 09d232a2444f47cfe7b1d1b408edf149 I think there's a bug somewhere, but I want lunch. Um. Yeah, there was a bug. I fixed it, but it means that md5sum was incorrect. I'll let it run a while... 631 with 92e2bc1a483e0973c11a73dd0fe77f7...

- Sun Mar 29, 2009 9:25 pm UTC
- Forum: Science
- Topic: eclipse=cloak-covered moon--how do I prove/disprove this?
- Replies:
**10** - Views:
**1871**

This is interesting. Let us briefly assume that the hypothesis is in fact plausible. Let us assume that we educated beings have been transported to the dark ages and must now convince the heathen anti-science zealots that we are in fact educated and that they are in fact zealots. How could we dispro...

- Wed Mar 11, 2009 12:44 am UTC
- Forum: Mathematics
- Topic: Graph: F(x)=x^∞
- Replies:
**25** - Views:
**3350**

He presumably is retracting his claim and saying instead that it does not converge for x<=-1

- Tue Mar 10, 2009 10:50 pm UTC
- Forum: Science
- Topic: Comical mistakes in your homework.
- Replies:
**144** - Views:
**17685**

I had someone ask me if impulse and momentum had the same units today. And then argue that they didn't.

I also somehow managed to work out in a calorimetry lab that my cheeto was storing more chemical energy than your average country consumed in its lifetime.

I also somehow managed to work out in a calorimetry lab that my cheeto was storing more chemical energy than your average country consumed in its lifetime.

- Tue Feb 24, 2009 2:10 am UTC
- Forum: Mathematics
- Topic: Traveling across a square
- Replies:
**24** - Views:
**6942**

You mathematicians always overthink everything. If you're walking strictly horizontally part of the time, and strictly vertically part of the time, sum all the displacement vectors with the same direction, and you get d_{x}=1 and d_{y}=1. 1+1=2.

- Tue Feb 17, 2009 7:04 pm UTC
- Forum: Mathematics
- Topic: Math Survey
- Replies:
**30** - Views:
**2705**

Are we assuming the first fool used all 40,000KM of the rope? I.e. that the Earth's circumference magically became 40,000km Yes, why else would that bit of information be there? I wonder how many sticks the second fool used? The assumption is that the rope was uniformly raised from the ground, but ...