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Math
Topic Started: Aug 30 2009, 06:25 PM (1,052 Views)
chagi
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Every forum should have a math topic! :D
Post mathemetical problems or such here!
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Timmeh
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Prove: There are an infinite number of prime numbers n such that n+2 is also a prime.

3 is one such prime, since 3+2 = 5, a prime number.
5 is one such prime, since 5+2 = 7, a prime number.
7 is not such a prime, because 7+2 = 9, a composite number.

GO
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chagi
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well screw you that was too hard

:/

I can proove that there's an infinte amount of primes though. :/
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Syntax Man
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Tim, you don't need to prove that there's an infinite number of primes because there are infinite numbers, as a result there will be infinite primes.
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Timmeh
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Syntax, that wasn't what I was asking, but your proof is stupid. That doesn't follow logically at all.
Here are the proofs for that though: http://en.wikipedia.org/wiki/Euclid%27s_theorem

chagi, I tricked you. That's an unsolved problem in mathematics :) No one on Earth knows the answer.
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chagi
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Timmeh,Sep 4 2009
03:02 AM
chagi, I tricked you. That's an unsolved problem in mathematics :) No one on Earth knows the answer.

Well that was mean. :?
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DeProgrammer
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I've learned some fun, applicable stuff in the last day! But it's a Calculus 2 class, so very few people would understand it. :P

...including this stuff (the latter half or so) and how to calculate the centroid of a region of uniform density and how to use that to calculate the volume of a solid of revolution of that region. :D

(So basically, I can now calculate how much pressure the water in my swimming pool exerts on the pool itself, assuming all the walls are perfectly vertical and flat, and I can calculate the volume of something perfectly radially symmetrical, like a AA battery or the top portion of a water bottle! Woo hoo!) Not that these are realistic scenarios at all. Calculus is dumb when it comes to this sort of thing...you could get a better estimation of the volume of any object by submersing it in a liquid than by trying to figure out the equation that makes up its edges. :P
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chagi
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DeProgrammer,Sep 4 2009
05:20 PM
I've learned some fun, applicable stuff in the last day! But it's a Calculus 2 class, so very few people would understand it. :P

...including this stuff (the latter half or so) and how to calculate the centroid of a region of uniform density and how to use that to calculate the volume of a solid of revolution of that region. :D

(So basically, I can now calculate how much pressure the water in my swimming pool exerts on the pool itself, assuming all the walls are perfectly vertical and flat, and I can calculate the volume of something perfectly radially symmetrical, like a AA battery or the top portion of a water bottle! Woo hoo!) Not that these are realistic scenarios at all. Calculus is dumb when it comes to this sort of thing...you could get a better estimation of the volume of any object by submersing it in a liquid than by trying to figure out the equation that makes up its edges. :P

link wont work :?
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Works fine for me. It's for calculating the total force of a liquid on a vertical plate that is submersed in said liquid.
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Timmeh
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Shitty link, use http://www.shmsoft.com/yosef/Calculus%20Te...lasSV_06_06.pdf instead.
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Timmeh,Sep 4 2009
04:02 AM
That's an unsolved problem in mathematics :) No one on Earth knows the answer.

There was one man but the north Koreans thought he was a dog ate him.
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chagi
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woah
physics

yeah i'm only good at pura math

i would be good at physics
if i was taught physics
but i am not taught physics
and so, i'm not good at physics
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chagi
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k

create an expression for the n:th number in the following sequence:

1 1 2 4 8 16 32 64 ...
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chagi,Sep 11 2009
07:09 AM
k

create an expression for the n:th number in the following sequence:

1 1 2 4 8 16 32 64 ...

All of the numbers added together make the next number.
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DeProgrammer
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Uh... it's 2^x. (x >= 0, x % 1 = 0)

Try something more interesting, like 0, 0.693, 1.099, 1.386, 1.609...
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