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I was just curious about how many people feel they have a truly good understanding of modern cryptography here. I also figured I'd try to get things going in this area of the forums. Do people here know about the different algorithms out there? RSA, MD5, etc. What they are and what they do? I'm also...

- on Mon Apr 28, 2008 12:39 am
- Forum: Crypto
- Topic: Understanding Cryptography
- Comments:
**18** - Views:
**17839**

If anyone has any problems they would like to present to see if someone can prove them that would be a good exercise to. I'll put this one out there.( as a general statement, don't put your homework problems up here though ). See if you can come up with a proof for DeMorgan's law, (A union B)^c = A^...

- on Sun Apr 27, 2008 6:00 pm
- Forum: Math & Science
- Topic: Math proof
- Comments:
**31** - Views:
**34440**

Here is the article that I wrote about Algebraic Groups. Algebraic Groups This is an introduction article to the theory of algebraic groups. There are a few things you need to know before I get started. They are as follows: Modulo arithmetic – modulo arithmetic, I will designate it by using mod n, i...

- on Sun Apr 27, 2008 5:27 pm
- Forum: Math & Science
- Topic: Interest in Math topics
- Comments:
**12** - Views:
**12076**

Here's one from discrete math. Show that the composition of 1 - 1 and onto functions is 1-1 and onto. Let A, B, and C be sets. If f(x) is a 1 - 1 and onto mapping from A --> B and g(x) is a 1-1 and onto mapping from B --> C, show g(f(x)) is 1-1 and onto. PF: Let x be an element of C. Then we k...

- on Sun Apr 27, 2008 2:42 pm
- Forum: Math & Science
- Topic: Math proof
- Comments:
**31** - Views:
**34440**

Well I submitted an article friday night and it was rejected a few minutes later. I have messaged asking why but still no response explaining the problems. So until I get a response as to why it was rejected to make it submittable I am willing to email it to anyone who has an interest in learning ab...

- on Sun Apr 27, 2008 2:22 pm
- Forum: Math & Science
- Topic: Interest in Math topics
- Comments:
**12** - Views:
**12076**

I don't know where you came up with the -2( 1/2 + ...) but I'm really not that good at series manipulation. But there is also the issue that that particular Mclaurin series is defined for -1 < x < 1 so ln(2) wouldn't be within the limits of the domain.

- on Sat Apr 26, 2008 6:18 pm
- Forum: Math & Science
- Topic: Math proof
- Comments:
**31** - Views:
**34440**

The main issue for both is that the property sqrt(xy) = sqrt(x)*sprt(y) only holds for positive real numbers. Here's a proof by induction to see if you can find the error. for the series of numbers 1 + 2 + 3 +.....+ n = n(n+1)/2 first show it's true for the test case, n=1, 1 * ( 1 + 1) /2 = 1. it ho...

- on Sat Apr 26, 2008 4:28 pm
- Forum: Math & Science
- Topic: Math proof
- Comments:
**31** - Views:
**34440**

i have the right answer but it doesn't work :| what am i doing wrong? There is no "for sure" answer - there's more than one possibility... what does that mean?? :?: math is math....there is always a "for sure" answer or r u saying that 1+1 could = 4? :lol: Actually there are not...

- on Sat Apr 26, 2008 12:22 pm
- Forum: Javascript
- Topic: javascript mission 3
- Comments:
**189** - Views:
**459186**

If you're running xp you can dual boot with linux installed first. That's how I have mine set up. I'm running Ubuntu though. The main thing it does is just set your windows drive to F which makes some software installation a bit screwy if it automatically tries to install to C, which has become your...

- on Sat Apr 26, 2008 12:13 pm
- Forum: Operating Systems
- Topic: Linux VS Windows
- Comments:
**53** - Views:
**57301**

Well the first issue is the fact that because x = y you can't divide by x - y, because then you are dividing by 0. The next problem I noticed is that ( x - y )/( x - y ) does not equal 1, if it were possible to divide by x - y it would equal 0/0, and therefore zero. so then you would get 0 = 0.

- on Sat Apr 26, 2008 11:53 am
- Forum: Math & Science
- Topic: Math proof
- Comments:
**31** - Views:
**34440**