## Search found 16 matches

- Mon Aug 16, 2010 7:54 am UTC
- Forum: Science
- Topic: magnetic moments of cations
- Replies:
**2** - Views:
**1257**

### magnetic moments of cations

First of all, I'm not getting Hund's rule. At all. I will now commence to explain what I think: having to explain the net magnetic moment of say Fe3+, which is given to be 5, the electrons in 3d occupy different orbitals and have the same spin, but that gives 3 electrons. Are the other 2 from s4? Do...

- Wed May 26, 2010 9:00 am UTC
- Forum: Mathematics
- Topic: Famous Math Quotes!
- Replies:
**32** - Views:
**8161**

### Re: Famous Math Quotes!

"I wouldn't describe myself as being particularly fanatical about mathematical induction, but it is rather cute." - Prof at my university

"Contrary to widespread belief, mathematicians do go to parties" - Ian Stewart

"Contrary to widespread belief, mathematicians do go to parties" - Ian Stewart

- Tue May 18, 2010 3:10 pm UTC
- Forum: Science
- Topic: 1st course on modern physics
- Replies:
**2** - Views:
**773**

### 1st course on modern physics

the first test results came back and less than 30% of the class passed. I guess I'm lucky then. But what I want is examples of problems, because the work really isn't that hard, it's just the way the lecturer asks it that is tricky and different from the textbook. Or any ideas on how to prepare bett...

- Thu Jan 14, 2010 1:58 pm UTC
- Forum: Mathematics
- Topic: roomies
- Replies:
**8** - Views:
**1218**

### Re: roomies

Any amount of people swapping rooms is a single swap. So if you have a configuration of persons in rooms, the next night any other configuration would be one swap.

I'm thinking of just randomizing and then change a few configurations to try get a working model.

I'm thinking of just randomizing and then change a few configurations to try get a working model.

- Wed Jan 13, 2010 3:28 pm UTC
- Forum: Mathematics
- Topic: roomies
- Replies:
**8** - Views:
**1218**

### roomies

I've been asked to set up a sleeping roster as follows: Suppose you have 12 people who live in a house with 4 rooms. The rooms can sleep 4, 3, 3 and 2 at a time. If each person has to sleep in every room atleast once and share a room with every other person atleast once, what is the least amount of ...

- Sun Dec 13, 2009 9:17 am UTC
- Forum: Mathematics
- Topic: Why do people keep saying this?
- Replies:
**42** - Views:
**4918**

### Re: Why do people keep saying this?

greengiant wrote:this should be 'an unicorn' I guess but it sounds funny

Nope, a unicorn, an unseen hippo, a hippo, an hour (couldn't think of a relevant word). See the pattern? Vowel sound gets an an.

- Mon Oct 12, 2009 7:50 pm UTC
- Forum: Mathematics
- Topic: Study hobbits and the lack thereof
- Replies:
**16** - Views:
**2491**

### Re: Study hobbits and the lack thereof

No mind maps or story visualizations? I've memorized a grid of numbers as a party trick with the visualization thing, but I never really used it to remember something useful or that can score me marks on a test. On that note, the current record for memorizing numbers in one hour is 1949 digits.

- Mon Oct 05, 2009 5:57 pm UTC
- Forum: Mathematics
- Topic: Study hobbits and the lack thereof
- Replies:
**16** - Views:
**2491**

### Study hobbits and the lack thereof

Anything in particular you do to prepare for a test? I'm wondering mainly about math and related subjects. Do you stare at the page until the formulae come alive? or just do a bunch of problems? Do you sit and memorize formulae? (I only managed to memorize the cubic root thing in 2nd year university...

- Sat Aug 08, 2009 11:17 am UTC
- Forum: Mathematics
- Topic: explicit formula
- Replies:
**7** - Views:
**1408**

### Re: explicit formula

Just because it diverges does not mean there is no explicit formula. Indeed, but my sentence construction skills might have you believe differently. As I posted this I realized that it can be written as the sum of two series x n = a n + b n where a n = (2/3) n b n = ∏(2/3) i(-1)^(i-1...

- Sat Aug 08, 2009 11:00 am UTC
- Forum: Mathematics
- Topic: Cube in a sphere in a cube.
- Replies:
**6** - Views:
**1574**

### Re: Cube in a sphere in a cube.

[quote="stephentyrone"]To be as large as possible, the corners of the little cube should be at the points where those lines intersect the sphere./quote]

Wouldn't the inner cube be the same size no matter how it's rotated?

Wouldn't the inner cube be the same size no matter how it's rotated?

- Sat Aug 08, 2009 10:35 am UTC
- Forum: Mathematics
- Topic: explicit formula
- Replies:
**7** - Views:
**1408**

### explicit formula

I have to explain this to a high school kid, but I have no clue myself. The question asked for an explicit formula for x

x

x

I couldn't see any pattern in the iterations, and I believe it diverges, contrary to what the question believes.

_{n}.x

_{n}= 2/3(x_{n-1}+ 1/(x_{n-1})^{2})x

_{0}= 1I couldn't see any pattern in the iterations, and I believe it diverges, contrary to what the question believes.

- Tue Jun 16, 2009 10:34 am UTC
- Forum: Books
- Topic: Books with gritty realism.
- Replies:
**11** - Views:
**2676**

### Re: Books with gritty realism.

Dostoevsky? Crime and Punishment, Notes From the Underground... I think they fall in that genre, but not as in your face as the wikipedia description suggests it should be.

- Fri Jun 12, 2009 9:52 pm UTC
- Forum: Mathematics
- Topic: Lost art?
- Replies:
**28** - Views:
**3416**

### Re: Lost art?

If you do any algebra, not knowing your multiplication tables will slow you down. Sure. calculators are cheap & easy to use, but swapping between pen & calculator several times per line will slow you down & can interrupt the train of thought. And it's almost impossible to factorize numb...

- Fri Jun 12, 2009 8:45 am UTC
- Forum: Mathematics
- Topic: Lost art?
- Replies:
**28** - Views:
**3416**

### Lost art?

I guess this is kind of related to the 'Are people besoming stupid because technology does everything for us' question. I bought a book with log tables. I think the main reason was so that when someone sees it on my bookshelf they would immediately know I am superior to them in bothknowledge and gee...

- Wed Jun 10, 2009 2:42 pm UTC
- Forum: Books
- Topic: Has any book "marked" you?
- Replies:
**28** - Views:
**4234**

### Re: Has any book "marked" you?

The Underground by Dostoyevski, it scared the crap out of me. I saw myself in the main character and he turned out pretty depraved/disturbed. Made me wonder what I'm capable of.

- Wed Jun 10, 2009 8:54 am UTC
- Forum: Music
- Topic: Recommend one artist
- Replies:
**1018** - Views:
**285974**