Question

need help..
describe this sets:
{2,3,5,7,11}
{-3,-2,-1,0,1,2}
{0,1,4,9,16,25}
{-8,-1,0,1,8,27}
{...,-3,-2,-1,0,1,2,...}

Answer 1

Last one is\[ \mathbb{Z} \]

Answer 2

First is the set of the 5 first prime number.

Answer 3

what do you mean by last one is a Z

Answer 4

Third is the suit of square : 1², 2², 3²; 4² ...
Last one if the set of integer : http://en.wikipedia.org/wiki/Integer

Answer 5

Z is the set of all integers

Answer 6

ok

Answer 7

i think the fourth one is the set of all perfect cubes between -8 and 27

Answer 8

how would you describe that in .... form: like x "is a subset of " (-8,0) (0, infinity] could that be annoted like that? (i know that is incorrect already from the ))

Answer 9

jimmyrep how about the rest?

Answer 10

paulzord : Set builder ?
\begin{Bmatrix}
x / x = y^3 , y \in \left \{-8,...,27 \right \}
\end{Bmatrix}

Answer 11

yep - thats right william

Answer 12

how about the second one ? thats a subset of Z, right?

Answer 13

to be honest i'm a little rusty in set theory

Answer 14

Would say somethig like that :
\[\begin{Bmatrix} x \: | \: x \in [-3 ; 2] \end{Bmatrix} \]
but seems a bit obvious. Integer modulo n perhaps ?

Answer 15

Or, for integer only: \[\begin{Bmatrix} x \: | \: x \in |[-3 ; 2]| \end{Bmatrix} \]