## Search found 92 matches

- Wed Oct 14, 2009 11:26 am UTC
- Forum: Mathematics
- Topic: So, does this work as a prrof that e^pi*i=-1?
- Replies:
**39** - Views:
**4225**

### Re: So, does this work as a prrof that e^pi*i=-1?

I shouldn't paint such a doom-and-gloom picture. There are some technical points like the above (ie. considering something in the complex case makes it more complicated) and there are others where things are actually much, much simpler. Better yet, sometimes you can turn a "real" problem (...

- Wed Oct 14, 2009 11:01 am UTC
- Forum: Mathematics
- Topic: So, does this work as a prrof that e^pi*i=-1?
- Replies:
**39** - Views:
**4225**

### Re: So, does this work as a prrof that e^pi*i=-1?

As in complex numbers are more than a fun trick to talk about square roots of negative numbers. Furthermore, there are more things you can do with them then multiply, divide, etc. The most natural thing you would want to do is...to extend the functions you already have. So for instance, there are lo...

- Tue Aug 11, 2009 11:51 pm UTC
- Forum: Mathematics
- Topic: Algebra 2?
- Replies:
**21** - Views:
**3061**

### Re: Algebra 2?

Just for clarification, it should be known that asymptotes can be intersected, even infinitely many times.

- Tue Aug 04, 2009 10:05 am UTC
- Forum: Mathematics
- Topic: Math notation question: "next step" in proofs
- Replies:
**18** - Views:
**2585**

### Re: Math notation question: "next step" in proofs

so, thus, hence, wherefore, implying, now, since, because, for, then, etc.

Those kind of words. Your proof should be beautiful!

(unless it's a weird logic proof, and then there's a pretty nice format for that)

Those kind of words. Your proof should be beautiful!

(unless it's a weird logic proof, and then there's a pretty nice format for that)

- Sat Jul 25, 2009 9:38 pm UTC
- Forum: Mathematics
- Topic: Introductions.
- Replies:
**8** - Views:
**1346**

### Re: Introductions.

"But we already have all the formulas and equations!" "Maths?" (consternated look upon face) 'Yeah, so I'm definitely the coolest person you know' (and then pop your collar and make Fonz thumbs) "???" And of course, the classic: "So you definitely don't have a girl...

- Sat Jul 25, 2009 10:03 am UTC
- Forum: Mathematics
- Topic: Introductions.
- Replies:
**8** - Views:
**1346**

### Introductions.

An example of one of my experiences. And you?

- Sun Jun 07, 2009 1:19 am UTC
- Forum: Mathematics
- Topic: Hitting Walls in Proofs
- Replies:
**15** - Views:
**1675**

### Re: Hitting Walls in Proofs

In an exam, as soon as I hit the slightest hurdle, I go on to the next question. My brain thinks very passively I guess? So I can frequently be seen flipping through the pages, working on several problems at once. Outside of an exam, if I can't see a way to do something, I give it a small moment, an...

- Mon Jun 01, 2009 1:46 pm UTC
- Forum: Mathematics
- Topic: Real-world examples of -x * -y = +z
- Replies:
**66** - Views:
**8358**

### Re: Real-world examples of -x * -y = +z

Minus times minus is plus, the reason for this we shall not discuss.

- Thu Apr 09, 2009 8:36 am UTC
- Forum: Mathematics
- Topic: Complex Analysis
- Replies:
**8** - Views:
**1376**

### Re: Complex Analysis

It's going to get worse before it gets better, kid. Still want to go down the rabbit hole?

- Tue Oct 07, 2008 9:17 pm UTC
- Forum: Mathematics
- Topic: Series question
- Replies:
**2** - Views:
**812**

### Re: Series question

Well, it kind of works like this (assuming I'm thinking of it straight). Remember the Taylor series for cos(x)? If not, it looks kind of like this: \cos x = \sum^{\infty}_{n=0} \frac{(-1)^n}{(2n)!} x^{2n}\quad = 1 - \frac{x^2}{2!} + \frac{x^4}{4!} - \cdots\text{ for all } x\! So, aft...

- Wed Jul 02, 2008 8:40 am UTC
- Forum: Mathematics
- Topic: infinity
- Replies:
**91** - Views:
**10688**

### Re: infinity

BasilRathbone wrote:Now some examples. Take this program:

0. Start

1. Go to 2

2. Go to 1

3. End

Simpler, and even more obvious example: How many paths are there from A to B? There's the straight line, one like a circle, a wavey one, one that goes around, ....

- Wed Jul 02, 2008 8:19 am UTC
- Forum: Mathematics
- Topic: One more Calculus problem
- Replies:
**3** - Views:
**1330**

### Re: One more Calculus problem

Sounds more like to me that once you work out the equilibrium, solve for t when theta = equilibrium plus or minus 5 degrees (in radians, of course).

This gives you a range -- when (time) less than (inside) 5 degrees either side (plus or minus) equilibrium.

That's how I think, at least.

This gives you a range -- when (time) less than (inside) 5 degrees either side (plus or minus) equilibrium.

That's how I think, at least.

- Sat May 10, 2008 10:54 am UTC
- Forum: Science
- Topic: Calculating level of concentration.
- Replies:
**3** - Views:
**1072**

- Tue May 06, 2008 7:42 am UTC
- Forum: Mathematics
- Topic: Diluting ratios.
- Replies:
**3** - Views:
**971**

### Re: Diluting ratios.

I guess you're like me, jaap, as the a:b ratio used to mess with my head too.

By the way, I swear I'm a maths major, which makes this all the more embarrassing.

By the way, I swear I'm a maths major, which makes this all the more embarrassing.

- Tue May 06, 2008 7:13 am UTC
- Forum: Mathematics
- Topic: Diluting ratios.
- Replies:
**3** - Views:
**971**

### Diluting ratios.

This is pretty embarrassing, but anyway: If I have 1mL of X, and add 49mL of water, the resulting ratio is 1:50. If I then take 5mL of this, and add another 5mL of water to top it up to the 10mL mark (ie. 1:2), what is the resulting ratio of X to water? It's actually more embarrassing now that I've ...

- Thu Apr 10, 2008 9:00 am UTC
- Forum: Mathematics
- Topic: A fun little problem I made when bored
- Replies:
**13** - Views:
**2262**

- Wed Apr 09, 2008 7:30 am UTC
- Forum: Mathematics
- Topic: Counterintuitive nature of symbolic logic?
- Replies:
**43** - Views:
**6100**

### Re: Counterintuitive nature of symbolic logic?

Maybe I'm misinterpreting this, but from what I see you're having trouble with a logical expression being "true", but this not reflecting reality? If this isn't the case, just ignore the rest of this post: Mathematical logic, as far as I've seen (yes, extremely little) merely reflects the ...

- Sun Nov 11, 2007 4:32 am UTC
- Forum: Mathematics
- Topic: TI-Nspire
- Replies:
**51** - Views:
**8802**

### Re: TI-Nspire

My maths C teacher was sent one of these to test, and he told me to use it for the term to assess it as to its usefulness for our course. I can imagine one being useful, just for checking certain things...but definitely not for every student. 84s reign supreme in our school. (I was reviewing it for ...

- Sun Sep 23, 2007 8:36 am UTC
- Forum: Mathematics
- Topic: Boy am I glad we don't get people from this forum here.
- Replies:
**53** - Views:
**7643**

- Fri Sep 21, 2007 9:19 am UTC
- Forum: General
- Topic: First xkcd comic you ever read
- Replies:
**46** - Views:
**5395**

- Fri Sep 14, 2007 6:23 am UTC
- Forum: General
- Topic: General Moderators - A War Hero
- Replies:
**95** - Views:
**19464**

- Tue Sep 11, 2007 5:00 am UTC
- Forum: Mathematics
- Topic: "Damped periodic functions"
- Replies:
**4** - Views:
**2432**

### "Damped periodic functions"

We've been looking at "damped / amplified periodic functions". I'm trying to write some practice questions for my friends, but coming up a bit dry. Google to the rescue! Unfortunately, I can't find anything on them at all. At. All. I mean equations of the form y = A*e^(ax)cos(bx) (or sin (...

- Mon Sep 10, 2007 8:35 am UTC
- Forum: Movies and TV Shows
- Topic: The IT Crowd
- Replies:
**58** - Views:
**11157**

- Sun Sep 09, 2007 9:09 pm UTC
- Forum: Movies and TV Shows
- Topic: Yu-Gi-Oh! - The Abridged Series
- Replies:
**33** - Views:
**4993**

- Thu Sep 06, 2007 8:52 pm UTC
- Forum: Music
- Topic: Totally inappropriate "our song"s
- Replies:
**46** - Views:
**6789**

- Thu Sep 06, 2007 9:12 am UTC
- Forum: General
- Topic: Idiotic teenagers
- Replies:
**104** - Views:
**9059**

- Thu Sep 06, 2007 7:02 am UTC
- Forum: General
- Topic: I have no idea what the point is . . . But I want one
- Replies:
**40** - Views:
**4296**

- Thu Sep 06, 2007 4:55 am UTC
- Forum: News & Articles
- Topic: Free speech at the University of Delaware
- Replies:
**28** - Views:
**4578**

- Wed Sep 05, 2007 7:34 am UTC
- Forum: General
- Topic: What kinds of Wikipedia edits do you make?
- Replies:
**37** - Views:
**3712**

I don't. I don't find wikipedia useful as more than a minor quick-reference, and I most certainly DO NOT work for free. I've worked damned hard to gain the knowledge and experience I have, I'll be damned if I'm going to give that away to the masses - in the worst case, I'd become less valuable as a...

- Wed Sep 05, 2007 6:27 am UTC
- Forum: Mathematics
- Topic: Peer-review my mathy blog post!
- Replies:
**23** - Views:
**3909**

### Re: Peer-review my mathy blog post!

Consider this, it's highly unlikely that C_10 contains the full decimal expansion of Pi :) Woah, this is like a really good point (to me). How would it be able to contain all the digits of pi, and all the digits of say square root two? (This is probably my mind not being able to understand the conc...

- Wed Sep 05, 2007 5:55 am UTC
- Forum: Mathematics
- Topic: Math Advice for High Schooler
- Replies:
**25** - Views:
**4270**

For maths C (ie. the upper maths subject in queensland), we have done... -- Basic vector stuff (spherical / cylindrical co-ordinates, 3 dimensions, dot product, vector product (mainly for volumes and areas)) -- Solving systems of equations with matrices / finding determinants of matrices in a few wa...

- Tue Sep 04, 2007 5:03 am UTC
- Forum: General
- Topic: What kinds of Wikipedia edits do you make?
- Replies:
**37** - Views:
**3712**

- Tue Sep 04, 2007 4:52 am UTC
- Forum: Serious Business
- Topic: A problem with creativity
- Replies:
**49** - Views:
**7262**

- Mon Sep 03, 2007 10:20 am UTC
- Forum: Mathematics
- Topic: Math Advice for High Schooler
- Replies:
**25** - Views:
**4270**

- Mon Sep 03, 2007 10:02 am UTC
- Forum: Hardware
- Topic: Building a new computer
- Replies:
**11** - Views:
**5132**

Going off on a tangent here, but I was wondering how much I'd be able to sell my computer for -- I want to get rid of it in favour of a new iMac. It's about a year old: Socket 939 3800+ (single core, 64bit) 512mb XFX 7900GTX XXX edition (Zalman cooler (vf900 if I remember correctly) Err...some dfi l...

- Sat Aug 25, 2007 11:36 pm UTC
- Forum: General
- Topic: Helium Balloon Photography > Kite Photography
- Replies:
**15** - Views:
**2181**

- Thu Aug 23, 2007 6:22 am UTC
- Forum: Science
- Topic: Pseudoscience and Gaia and other non-CERN stuff
- Replies:
**77** - Views:
**8137**

- Thu Aug 23, 2007 6:19 am UTC
- Forum: Your art and links
- Topic: My first "real" work of art
- Replies:
**7** - Views:
**1910**

- Wed Aug 15, 2007 6:27 am UTC
- Forum: General
- Topic: Death Threats
- Replies:
**54** - Views:
**4993**