If T = {integers} and subset W = {positive integers}, what is W'?

{1, 2, 3, ...}
{..., -3, -2, -1, 0}
{-3, -2, -1, 0}
{ }

I get that W' is all the numbers that couldn't be W... or something along those lines. I just don't know which answer would be correct here.

Question

If T = {integers} and subset W = {positive integers}, what is W'?

 {1, 2, 3, ...}
 {..., -3, -2, -1, 0}
 {-3, -2, -1, 0}
 { }

I get that W' is all the numbers that couldn't be W... or something along those lines. I just don't know which answer would be correct here.

geerky42 · Answer

Assume $T$ is universal set, then yeah, $W'$ contains integers that is not in $W$.

leahhhmorgannn · Answer

What's a universal set?

geerky42 · Answer

Basically a set that contains everything, everything that we are interested in now.

irishboy123 · Answer

.

geerky42 · Answer

So $W'$ is set that contains everything except any elements in $W$.

geerky42 · Answer

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