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Maths time /sci/

Name: Anonymous 2008-02-26 20:22

People should post more maths.

Find a number k such that n^4 + k is composite for all integer n.

Name: Anonymous 2008-02-26 22:17

14

Name: 4tran 2008-02-27 0:24

>>2
Nice.
How do you show it when n is divisible by 15?

Name: Anonymous 2008-02-27 9:15

>>2

Well found sir, but you forgot your proof

Name: Anonymous 2008-02-27 11:10

>>4
That wasn't the question.

Name: Anonymous 2008-02-28 9:29

>>5

It's a maths question, not a physics question, prove your shit.

Name: Anonymous 2008-02-28 10:25

Well for starters, if n^4 + k is not even, then there is a chance that it might be a prime.
Clearly, we have to prove that n^4 + k is *not* prime.
That is rather easy to achieve, since n^4 is always even.
Therefore, n^4 + k where k is even shall do.
14 is even

Name: Anonymous 2008-02-28 10:38

That is rather easy to achieve, since n^4 is always even.
Lol.

Name: Anonymous 2008-02-28 12:16

>>7

What? Why choose 14, why not 2. n^4 is not always prime.

You're an idiot.

Name: Anonymous 2008-02-28 12:17

>>9

n^4 is not always even, what I meant.

The other is also true, but rather irrelevant.

Name: Anonymous 2008-02-28 12:32

>>9,10
both incorrect.
1. x^4 is x^2 * x^2.
2. x^2 is always even.
3. let y = x^2
4. then x^2 * x^2 = y^2
5. see 3
QED

Name: Anonymous 2008-02-28 12:46

>>7->>11 I can't tell who's trolling who anymore

Name: Anonymous 2008-02-28 13:24

>>9
n^4 is never a prime.

Name: Anonymous 2008-02-28 14:38

>>13

I know, read >>10, also the statement "n^4 is not always prime" is still true. I meant even though

Name: Anonymous 2008-02-28 14:39

>>14
Not always prime implies it's at least once a prime.
So it's false.

Name: Anonymous 2008-02-28 16:14

>>11
2. x^2 is always even.
I can understand making that mistake once, if you're drunk, but twice? Exponentiation is not multiplication.

n % 2 = n^4 % 2

ALWAYS

>>15
You're a fucking idiot. lrn2logic.

Name: Anonymous 2008-02-29 0:49

Exponentiation is not multiplication.
...

Name: Anonymous 2008-02-29 1:23

>>17

He meant the two don't behave the same.  e.g. while x*2 is always even, x^2 is not (so long as x is an integer).

Name: Anonymous 2008-02-29 9:09

>>18
e.g. while x*2 is always even,
Fail.
x=0

Name: Anonymous 2008-02-29 9:12

>>19
I think he means that x belongs in N

Name: dra nada 2008-02-29 12:43

n^4 is never a prime.
     let x = n^4 = nnnn -> n|x, nn|x, etc

i call troll

Name: Anonymous 2008-02-29 14:04

>>15


Er, "not always" doesn't imply "is once".

Maybe linguistically, but strictly logically, no.

Name: Anonymous 2008-02-29 14:12

>>19
0 is even, faggot.

Name: Anonymous 2008-03-01 5:53

>>23
whatever you say faggot, what about x=0.5??
Is that even too?

Name: Anonymous 2008-03-01 10:17

>>24
Good thing we're talking about integers then, isn't it?

Name: Anonymous 2008-03-01 20:25

>>25

0.5 is an integer you fucking faggot.

Name: Anonymous 2008-03-01 21:44

>>26
Bzzzt, wrong.  Go back to failschool.

Name: Anonymous 2008-03-02 8:07

>>27

Uh, no. 1 is an integer, 2 is an integer, integers are closed under field operations. Hence 0.5 is an integer.

Name: 4tran 2008-03-02 8:31

>>28
The integers are NOT closed under field operations because they do not form a field.  They are a group under addition, but that is not sufficient for defining a field.  You're thinking of the rationals.

Name: Anonymous 2008-03-02 10:21

I love this thread

Name: Anonymous 2008-03-02 12:03

>>29

You're thinking of the reals. Get back to taking limits cunt.

Name: Anonymous 2008-03-02 12:04

>>29

You're so obviously being trolled.

Name: Anonymous 2008-03-02 12:59

>>24
>>26
>>28
Same faggot, and we have been trolled constantly.

Name: mol. bio. major 2008-03-03 3:12

So this is what math is like

still I'd rather have the hot girls in biology

Name: Anonymous 2008-03-03 7:18

>>34

And it's impossible to get the hot biology girls if you're not doing biology.

Name: Anonymous 2008-03-03 12:01

>>34
Because you get all the hot girls in your class when you go to biology.

Name: Anonymous 2008-03-03 14:16

my frends and i mutual mastrb8 in maths
just as good

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