## Search found 1178 matches

- Sun May 31, 2009 1:16 am UTC
- Forum: Science
- Topic: The First Self-Replicator?
- Replies:
**10** - Views:
**1517**

### Re: The First Self-Replicator?

Proteins are as 1-D as DNA is, being a straight line sequence of amino acids that is just tangled up in 3D space. They're like a tangled knot of string.

- Fri May 22, 2009 5:46 am UTC
- Forum: Science
- Topic: Have you ever wished a particular theory didn't work?
- Replies:
**59** - Views:
**5185**

### Re: Have you ever wished a particular theory didn't work?

I wonder what it'd be like to live in a world without causality. I suppose it'd be like trying to determine the order of cars driving around in an infinite parking lot instead of on an infinite one-way highway.

- Fri May 22, 2009 12:42 am UTC
- Forum: Mathematics
- Topic: My friend thinks that you can divide by zero.
- Replies:
**35** - Views:
**4858**

### Re: My friend thinks that you can divide by zero.

If 1/0 = \infty , then \infty\times0 = 1 (this is the definition of division). So: \begin{eqnarray} 0+0 & = & 0 \\ \infty\times(0+0) & = & \infty\times0 \\ \infty\times0 + \infty\times0 & = & \infty\times0 \\ 1 + 1 & = & 1 \\ 2 & = & 1 \end{eqnarray} ...

- Thu May 21, 2009 6:09 pm UTC
- Forum: Mathematics
- Topic: My friend thinks that you can divide by zero.
- Replies:
**35** - Views:
**4858**

### Re: My friend thinks that you can divide by zero.

Just use that to prove that 2 = 1. If that doesn't work then you're friend is beyond help. That only works if 0/0 = 1, not if 1/0 = \infty . a = b = 1 a = b ab = b^2 ab - a^2 = b^2 - a^2 a(b - a) = (b + a)(b - a) The next step is to divide both sides by (b - a), leaving a = b + a, but that doesn't ...

- Fri May 15, 2009 6:49 am UTC
- Forum: Language/Linguistics
- Topic: expressions/turns of phrase tha you love . . . share the joy
- Replies:
**52** - Views:
**6436**

### Re: expressions/turns of phrase tha you love . . . share the joy

I used to dislike "the exception that proves the rule" until I knew what it meant (if there weren't a rule, you wouldn't have to make an exception).

- Sun May 03, 2009 6:01 am UTC
- Forum: Language/Linguistics
- Topic: Euphemisms
- Replies:
**55** - Views:
**6795**

### Re: Euphemisms

Bobber wrote:I was watching Soylent Green when I heard another one: locate as a euphemism for find. "I can't locate it!" really just means "I can't find it!" in most cases - saying locate just makes you sound less senile.

That's a synonym, not a euphemism.

- Fri Apr 17, 2009 3:50 am UTC
- Forum: Mathematics
- Topic: Definition of algebraic number
- Replies:
**16** - Views:
**1346**

### Re: Definition of algebraic number

Hackfleischkannibale wrote:strawberries are nuts

I think a better comparison would be saying that oranges are berries.

- Tue Mar 17, 2009 11:22 pm UTC
- Forum: Mathematics
- Topic: Irrational numbers don't exist
- Replies:
**51** - Views:
**5339**

### Re: Irrational numbers don't exist

chapel wrote:To paraphrase Douglas Adams: If you manage to convince yourself that black is white, you kill yourself at the first zebra that walks by.

Just to clarify, the exact quote is "[Man] goes on to prove that black is white and gets himself killed at the next zebra crossing."

- Tue Feb 24, 2009 1:12 am UTC
- Forum: Mathematics
- Topic: Homework: I am stuck regarding Geometric Mean in Triangles
- Replies:
**11** - Views:
**819**

### Re: Homework: I am stuck regarding Geometric Mean in Triangles

Internetmeme wrote:I can't use the Quadratic Formula, because the 36 would become negative moving it over to make the equation equal to zero, or can I?

You can.

- Sat Dec 20, 2008 5:34 am UTC
- Forum: Mathematics
- Topic: On the capabilities of functions
- Replies:
**25** - Views:
**2450**

### Re: On the capabilities of functions

MartianInvader wrote:If you don't like sin(x) but you're okay with imaginary numbers, you could always try e^{ix} - e^{-ix}... don't worry, it always gives you a real answer. Heh heh heh.

That should be [imath]e^{ix}+e^{-ix}[/imath]

- Mon Dec 15, 2008 12:41 am UTC
- Forum: Science
- Topic: Resistance and potentiometers
- Replies:
**2** - Views:
**686**

### Re: Faster than the Speed of Light-Without violating relativity

You can't talk about scientific theories lacking scientific education without mentioning Neal Adams and his expanding earth theory . I've had a (nominally) similar idea that, because gravity is acceleration, perhaps the Earth is actually expanding outward at 9.81 m/s. Of course, this would imply th...

- Sun Oct 26, 2008 7:01 pm UTC
- Forum: Gaming
- Topic: You gotta get into Dwarf Fortress if you haven't already.
- Replies:
**4583** - Views:
**607772**

### Re: You gotta get into Dwarf Fortress if you haven't already.

Awia wrote:What do I do with a lone art_image-10.dat file when I download a save, I can't for the life of me get it to work.

I believe you can do exactly nothing with just that.

- Mon Oct 20, 2008 3:11 am UTC
- Forum: Mathematics
- Topic: Trig functions, derivation, and calc homework
- Replies:
**5** - Views:
**985**

### Re: Trig functions, derivation, and calc homework

Ah, I get it now. Still, it kinda seems like they just pulled that out of nowhere.

- Mon Oct 20, 2008 1:54 am UTC
- Forum: Mathematics
- Topic: Trig functions, derivation, and calc homework
- Replies:
**5** - Views:
**985**

### Trig functions, derivation, and calc homework

One problem in my AP Calc homework is as follows: tan y = x Find dy/dx implicitly and find the largest interval of the form -a < y < a such that y is a differentiable function of x. Then express dy/dx as a function of x. So I got dy/dx = cos 2 y Interval is -pi/2 < y < pi/2 y = tan -1 x, so dy/dx = ...

- Sat Oct 04, 2008 3:13 am UTC
- Forum: Mathematics
- Topic: University Calculus Bonus Problem
- Replies:
**16** - Views:
**1983**

### Re: University Calculus Bonus Problem

Assuming that Alice and Bob each get the piece the other didn't pick, I'd say the maximum cake Alice can get is 1.9999, as she cuts an infinitesimal slice off of each cake and Bob, not wanting any cake to begin with, takes the 0.0000001 slice of cake.

- Fri Sep 26, 2008 11:51 pm UTC
- Forum: Science
- Topic: Total energy of an ideal fluid in a pipe...
- Replies:
**11** - Views:
**961**

### Re: Total energy of an ideal fluid in a pipe...

I believe the energy goes into pushing the fluid in front of it further down the pipe.

- Tue Sep 16, 2008 2:34 am UTC
- Forum: Mathematics
- Topic: Divisibility rules
- Replies:
**6** - Views:
**2117**

### Divisibility rules

I was wondering to myself the other day, "How come if you add up all the digits in a (base 10) number, you can tell if it's divisible by 3 or 9?" So I did some thinking about it and came up with these: Simple divisibility rules for a whole number x in base n. (n being a positive integer): ...