## Search found 90 matches

- Wed Mar 28, 2012 5:38 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1035: “Cadbury Eggs”
- Replies:
**116** - Views:
**36400**

### Re: 1035: “Cadbury Eggs”

Equating Cadbury eggs with their sugar content is kind of stupid. Nutritionally speaking, Cadbury eggs also have a significant amount of fat upping the calorie count, whereas soda is fat free. (Being fat free doesn't exactly make them healthy, but it makes them very much different.) And Cadbury eggs...

- Tue Feb 21, 2012 2:14 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1019: "First Post"
- Replies:
**76** - Views:
**21475**

### Re: 1019: "First Post"

I'm kind of tepid about the whole idea of nested posts in general. Single-threaded posting allows for a more natural conversation format since people can reply to posts informally, and to multiple posts simultaneously. And single-threaded posts absolutely have to be in chronological order for any so...

- Mon May 25, 2009 4:26 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0588: "Pep Rally"
- Replies:
**184** - Views:
**36194**

### Re: "Pep Rally" Discussion

Pep rallies are of course profoundly creepy, and there are entirely valid comparisons to be made between them and for example Fascism, but there's something far too easy about making fun of them. Nearly every single person who reads this comic will have already reached this conclusion and thought of...

- Sun Feb 15, 2009 7:16 am UTC
- Forum: Mathematics
- Topic: Simultaneous? I don't know..
- Replies:
**6** - Views:
**765**

### Re: Simultaneous? I don't know..

Did you have a typo in the word problem you presented? Unless I'm making a stupid mistake, it looks like the cost of carrots is a negative number after I fix the equations to match the description you gave, which shouldn't be right.

- Sun Feb 15, 2009 7:02 am UTC
- Forum: Mathematics
- Topic: Simultaneous? I don't know..
- Replies:
**6** - Views:
**765**

### Re: Simultaneous? I don't know..

P and C are the solutions. P is the price (in pennies, it looks like) of a kg of potatoes, and C is the price of a kg of carrots, which is how you are supposed to get the equations. Having a non-integer solution is annoying considering that you're talking about the cost of things and that's not how ...

- Sat Feb 14, 2009 4:47 am UTC
- Forum: Mathematics
- Topic: best excuse for being fat!
- Replies:
**17** - Views:
**2811**

### Re: best excuse for being fat!

point to a slim guy and state that the two of you are topologically equivalent! one can be obtained from the other by stretching or shrinking, and you both contain the same number of holes! Two spaces cannot be homeomorphic if one has a larger cardinality. A fatter person has more fat cells than a ...

- Sun Feb 01, 2009 12:57 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0537: "Ducklings"
- Replies:
**150** - Views:
**46893**

### Re: "Ducklings" Discussion

Every now and then, an army ant colony does this by itself. Ants have this self-organisation rule, saying they should follow a trail that has been marked as a trail to food, or else follow the ant in front of them. In absence of food, this can lead to ants marching in a long line. Occasionally, thi...

- Mon Jan 19, 2009 5:04 am UTC
- Forum: Mathematics
- Topic: Official: Math Jobs Don't Suck
- Replies:
**39** - Views:
**3115**

### Re: Official: Math Jobs Don't Suck

This might just be a consequence of their rating system. A high-scoring job was in nice working conditions, safe, non-physical, and fairly high-paying. Frankly, I'd rather be a snake boxer. A lot of math blogs I come into contact with have had the response of "This is totally an artifact of a ...

- Sun Jan 04, 2009 8:16 pm UTC
- Forum: Mathematics
- Topic: Boy or Girl Paradox
- Replies:
**126** - Views:
**14041**

### Re: Boy or Girl Paradox

it seems plausible to me that the probability of girl/girl given this information is higher than that of either boy/girl or girl/boy individually. Plausible doesn't mean anything; that's the same kind of intuition that leads people to the wrong answer to the Monty Hall problem. Can you provide any ...

- Mon Sep 01, 2008 5:12 pm UTC
- Forum: Mathematics
- Topic: I don't get HS math oympiads
- Replies:
**17** - Views:
**2831**

### Re: I don't get HS math oympiads

Which, if so, brings me to the purpose of the post: what's the point? Why would anybody find beauty in being delegated into a field of work that computers can do and preform much more efficiently? I don't see any intellectual value to be gained, and I don't understand exactly how memorizing algorit...

- Mon Jun 23, 2008 4:14 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0440: "Road Rage"
- Replies:
**94** - Views:
**31094**

### Re: "Road Rage" Discussion

It took me a little while to realize this was Hat Guy and Journal Girl.

- Thu Jun 19, 2008 5:05 am UTC
- Forum: Mathematics
- Topic: Steady State Solutions?
- Replies:
**18** - Views:
**2505**

### Re: Steady State Solutions?

Is it just subjective or is there something special which makes sin(t) become the steady state? If memory serves me correctly, it's the steady state solution because the exponential dies out as 't' tends to infinity. The function is then in a steady state of simple harmonic motion, whereas it start...

- Thu Jun 19, 2008 4:02 am UTC
- Forum: Mathematics
- Topic: Steady State Solutions?
- Replies:
**18** - Views:
**2505**

### Re: Steady State Solutions?

I have learnt that the steady-state solution describes the behaviour of the system as the independent variable goes to infinity. To give a very simple example, say a solution to your differential equation is x = (sin t)(1 + e -t ), then the steady-state solution would simply be sin t; (sin t)e -t w...

- Tue Jun 17, 2008 7:51 pm UTC
- Forum: Mathematics
- Topic: Steady State Solutions?
- Replies:
**18** - Views:
**2505**

### Re: Steady State Solutions?

I have learnt that the steady-state solution describes the behaviour of the system as the independent variable goes to infinity. To give a very simple example, say a solution to your differential equation is x = (sin t)(1 + e -t ), then the steady-state solution would simply be sin t; (sin t)e -t w...

- Fri Jun 13, 2008 8:24 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0436: "How It Happened"
- Replies:
**168** - Views:
**38841**

### Re: "How It Happened" Discussion

space_raptor wrote:I set em up, he knocks em down, go team!

I really don't want to think about what sort of kinky nonsense led her to say that.

- Fri Jun 13, 2008 4:47 am UTC
- Forum: Mathematics
- Topic: The grammar of XML
- Replies:
**5** - Views:
**2320**

### Re: The grammar of XML

It should be noted that <b><i>This sort of text where tags are not closed in first-in-last-out order</b></i> is not considered acceptable XML. I am pretty sure that it is not possible for a context free grammar to match up XML-style tags if they are not required to be closed in order, as a result of...

- Thu May 22, 2008 11:29 pm UTC
- Forum: Mathematics
- Topic: A Matter of Steam-Powered Math
- Replies:
**29** - Views:
**3183**

### Re: A Matter of Steam-Powered Math

The posters above said what I was going to say. There is no fundamental difference between the Analytic Engine and a modern electronic computer. They both work by cranking through algorithms, not by "physically doing" the division. If a machine ignored the rules of division, it would eithe...

- Fri May 02, 2008 4:14 am UTC
- Forum: Mathematics
- Topic: Elastic collisions between more than two billiard balls
- Replies:
**20** - Views:
**4493**

### Re: Elastic collisions between more than two billiard balls

It occurs to me (especially if you're writing a computer program and don't have to deal with solving the differential equations this would involve) that you could just solve the problem in term of forces rather than energy and momentum. When two balls are close enough that they're touching, the forc...

- Thu Apr 24, 2008 6:26 pm UTC
- Forum: Mathematics
- Topic: Your favorite paradox
- Replies:
**159** - Views:
**22433**

### Re: Your favorite paradox

stoke wrote:I would have to go with Russell's paradox: in naive set theory it should be possible to create the set of all sets that contain themselves.

Russell's paradox is about the set of all sets that don't contain themselves. Although your set is probably problematic too.

- Sat Apr 19, 2008 2:51 am UTC
- Forum: Mathematics
- Topic: ideas for a statistics or math-themed bday cake?
- Replies:
**20** - Views:
**3717**

### Re: ideas for a statistics or math-themed bday cake?

Something I just found on Wikipedia is that 29 is the 7th term in the Lazy caterers sequence which means that the most pieces of a round (or similarly nicely shaped) object that you can get by making straight cuts is 29. (The algorithm being that on each slice you make a cut such that the cut inters...

- Mon Apr 14, 2008 4:40 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0410: "Math Paper"
- Replies:
**92** - Views:
**32043**

### Re: "Math Paper" Discussion

hehe my friend once wrote " i = Jesus" on a white board. this girl almost cried when he explained it to her It's a fairly standard bit of Christian theology that God (and due to the nature of the trinity, Jesus) created Satan, but that Satan fell to sin due to his pride and thus sin enter...

- Mon Apr 14, 2008 4:27 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0410: "Math Paper"
- Replies:
**92** - Views:
**32043**

### Re: "Math Paper" Discussion

When I found out that sexy primes existed, my immediate reaction was that I wanted to become a professional mathematician in the field of number theory and write a paper which studied sexy primes and was very silly about it.

- Sat Mar 29, 2008 12:35 pm UTC
- Forum: Mathematics
- Topic: pi is arcsin( 1 ) * 2 !!!!! // fixed // cracked
- Replies:
**17** - Views:
**4767**

### Re: Pi is arcsin(0) !!!!!!

No it isn't. arcsin(0) = 0.

arcsin(1) - arcsin(-1) != arcsin(0).

Edited to add: Pi is a zero of sin(x), but not the one that arcsin(x) produces.

arcsin(1) - arcsin(-1) != arcsin(0).

Edited to add: Pi is a zero of sin(x), but not the one that arcsin(x) produces.

- Wed Mar 19, 2008 10:45 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0398: "Tap That Ass"
- Replies:
**108** - Views:
**39112**

### Re: "Tap That Ass" Discussion

Wait a minute, let me get this straight. As far as I knew (before reading this topic) British: Arse = that thing people sit on, vulgar Ass = that other thing people sit on that moves, not vulgar American : Ass = that thing people sit on, partially vulgar Arse= does not exist This right? Yes, at lea...

- Fri Mar 14, 2008 11:06 pm UTC
- Forum: Mathematics
- Topic: Solving Euler's identity to make a quote
- Replies:
**33** - Views:
**4001**

### Re: Solving Euler's identity to make a quote

Wikipedia gives a relatively simple proof of Euler's identity that just uses differential Calculus: Let f(x) = (cos(x) + i * sin(x))/(e^(xi)). Differentiating that, you get that f'(x) = 0. Thus f is constant, so f(x) = f(0) = 1. Thus, e^(xi) = cos(x) + i sin(x) , thus e^(pi i) = -1 thus e^(pi i) + 1...

- Mon Mar 10, 2008 7:38 pm UTC
- Forum: News & Articles
- Topic: Clinton calls Obama black
- Replies:
**72** - Views:
**8661**

### Re: Clinton calls Obama black

It's this sort of thing that has made me wonder how people still stand for Clinton at all. There's no way I'd be able to do it. Some time, I hope, people are going to notice the pattern of lying. And I don't think this is little stuff, they're lying about things that are grossly obvious and documen...

- Sun Mar 09, 2008 9:57 am UTC
- Forum: Mathematics
- Topic: Finding a monic polynomial given a root
- Replies:
**6** - Views:
**2153**

### Re: Finding a monic polynomial given a root

Yeah. That polynomial you say doesn't have integer coefficients. Also, I'm not entirely sure why your calculator is giving you those numbers. The roots of (x + (2^(1/2) + 2^(1/3)) * (x - (2^(1/2) + 2^(1/3))) should be around plusorminus 2.674. Did you make a typo or something when you put it into yo...

- Fri Mar 07, 2008 6:25 am UTC
- Forum: Mathematics
- Topic: Why do people dislike maths so much?
- Replies:
**258** - Views:
**29685**

### Re: Why do people dislike maths so much?

a few people just hate math because they want a subject like poetry where you can't be wrong and you can say whatever you like and people will respond "what a great idea". people just don't want to accept that you can decide that what one person said is worth more then what they said. Thi...

- Wed Mar 05, 2008 5:14 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0392: "Making Rules"
- Replies:
**157** - Views:
**27737**

### Re: Making Rules

Contrabass wrote:And that wasn't even a convertible...

I don't think you understand how punch bugs work. Punch bug refers to the Volkswagen Bug, that is, if a Volkswagen Beetle drives past you while you are next to a peer, you can punch them. What the hell would convertibles be justifiable?

- Sat Mar 01, 2008 11:53 pm UTC
- Forum: Mathematics
- Topic: Drag
- Replies:
**15** - Views:
**1653**

### Re: Drag

For fluids where viscosity is low, I believe that quadratic drag is generally considered the better approximation than linear drag. That is, drag is a force in the opposite direction to motion proportionate to the square of the speed times the cross sectional area of the object times times the drag ...

- Fri Feb 29, 2008 2:11 pm UTC
- Forum: Mathematics
- Topic: Vector transformations and linear algebra
- Replies:
**3** - Views:
**1217**

### Re: Vector transformations and linear algebra

I'm not entirely sure what exactly you mean, but one possible explanation might be that all linear functions from R n to R m can be represented as a matrix, for the following reason: A linear function f is one such that for every vector x,y and every scalar r (typically a real number) f(x + y) = f(x...

- Tue Feb 26, 2008 12:38 am UTC
- Forum: Mathematics
- Topic: Why do people dislike maths so much?
- Replies:
**258** - Views:
**29685**

### Re: Why do people dislike maths so much?

What I find amusing is that the word "integral" has two completely unrelated mathematical meanings and each of those have absolutely nothing to do with its usage in ordinary speech. There might be other examples of this, but I can't think of any off the top of my head.

- Sun Feb 24, 2008 9:25 am UTC
- Forum: Mathematics
- Topic: Hyperpowers of 2
- Replies:
**17** - Views:
**3112**

### Re: Hyperpowers of 2

I assume that he means that a million refers to 10^6 and a billion is 10^9 (and so on) whereas other parts of the world do it such that 10^6 is a million, 10^9 is a thousand million, and 10^12 is a million million or a billion. (To continue, 10^15 is a thousand billion and 10^18 is a trillion) Wikip...

- Thu Feb 21, 2008 1:46 am UTC
- Forum: Mathematics
- Topic: 1=0.99999999... as related to fractals
- Replies:
**40** - Views:
**4769**

### Re: 1=0.99999999... as related to fractals

An argument for 1 = 0.9999... that I've always found pretty intuitive is: x = 0.999... therefore 10x = 9.999... therefore 9x = 10x - x = 9 , therefore x = 9x/9 = 1, therefore 0.999... = 1 QED. It seems like it should be possible to extend this style of reasoning to the area of the Sierpenski gasket ...

- Wed Feb 20, 2008 8:39 am UTC
- Forum: Mathematics
- Topic: Why is the derrivative of the volume of a sphere its area?
- Replies:
**41** - Views:
**6190**

### Re: Why is the derrivative of the volume of a sphere its area?

Just to state the obvious, the same is true for 2D, and presumably higher dimensions as well.

Also, when you try to apply it to 1D, you end up getting that the "perimeter" of a 1D dimensional disk (that is, a line segment) is 2, which seems about right I suppose.

Also, when you try to apply it to 1D, you end up getting that the "perimeter" of a 1D dimensional disk (that is, a line segment) is 2, which seems about right I suppose.

- Sun Feb 10, 2008 4:08 pm UTC
- Forum: Mathematics
- Topic: How do they find big primes?
- Replies:
**19** - Views:
**3212**

### Re: How do they find big primes?

No. For instance, 2^4 - 1 = 15. However, primes of the form 2^n - 1 have certain nice properties such that it's easier to find them.

- Tue Feb 05, 2008 10:28 pm UTC
- Forum: Mathematics
- Topic: Why do people dislike maths so much?
- Replies:
**258** - Views:
**29685**

### Re: Why do people dislike maths so much?

You're probably absolutely right about them existing. I just know they're called imaginary, which to me means they don't actualy exist. I admit that doesn't mean much as my mathematical ability is not all that great. It's a point of some philosophical debate, but I'm of the opinion that no numbers ...

- Fri Feb 01, 2008 12:16 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0378: "Real Programmers"
- Replies:
**201** - Views:
**59087**

### Re: Real Programmers Discussion

Heh, reminds me of the Yorkshiremen sketch from Monty Python :) In my day, we didn't have the Yorkshiremen sketch. (Which is actually from "At Last the 1948 Show," not Monty Python proper, although Monty Python would later perform it.) We had to walk there uphill in the snow both ways to ...

- Wed Jan 30, 2008 4:47 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0377: "Journal 2"
- Replies:
**346** - Views:
**55889**

### Re: "Journal 2" Discussion

I think everyone is underestimating black hat man. He was certainly surprised and the way he moved his hands (particularly second to last panel) looked a little pathetic. But I think thats just because he finally met someone he could compete with. Maybe he got owned but, only because he was expecti...

- Mon Jan 28, 2008 9:54 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0376: "Bug"
- Replies:
**97** - Views:
**36069**

### Re: 'Bug' discussion

I feel the fact that January 1, 1970 is very close to when ARPANET was started is only further proof of the fact that the world was created in 1970.