Recent content by kureta

I don't mean to be rude or arrogant (because maybe all my questions were stupid and not worth spending time on) but I've asked 4 questions in this forum and the best answer I got (if any) was "err... I knew this but i forgot". Of course this is not a Q&A forum. This is a discussion forum. But...

[SOLVED] centroid of a moebius strip Since the edge of a moebius strip is topologically equivalent to a circle, we can cut a disk form an euclidean 2D plane and sew a moebius strip on its place. Now we have a 2D space with a circular-edged moebius strip added. And now this strip is a 2D region...

i have been thinking about my question. we are talking about a 2 dimensional surface. but talking about sides requires 3 dimensions. think about a 3 dimensional analogous. i am in a cube shaped room and a 4 dimensional guy is observing this room. the room lacks a length in 4th dimension just...

i don't know. are there several ways or no way to define that?

[SOLVED] Mobius Strip we have a normal strip of paper with surface area=A. if we make a mobius strip with it what will be the area of the mobius strip? is it A or 2A?

ramsey2879 you're the man ramsey2879 your reply was the kind that i was looking for. thanks. but taking n to be prime makes this formula useless for me. because my purpose is to find a set of coprimes generated by a simple function . and you should see "a different approach to primes" thread...

2^2-1=3 and 2^4-1=15 and 15/3=5 so they are not all coprimes am i wrong?

then i should change my question does anyone know such a set AND its defining formula which gives us the nth term.

yesss yes. thanks but... well... nevermind:rolleyes:

[SOLVED] infinite set of coprimes does anyone know an infinite set of coprimes except for the elements of sylvester's sequence. S(n)=S(n-1)*(S(n-1)-1)+1, with s(0)=2

i think i couldn't explain myself. Let me put it this way. for example i choose {5,6,7} as my set of prime numbers. so in my system, natural numbers are 5,6,7,25,30,35,... because normally natural numbers are obtained by multiplying primes in every possible way. this is some kind of reverse...

[SOLVED] A different approach to prime numbers i read something about choosing a finite set of numbers as primes and deriving the other numbers from aforementioned set so that every number is obtained by multiplying primes (the numbers you choose to be prime in your system) in every possible...