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not

~A=not A
or elements which are not in A

means the same as ( \(\neg\) )

when used like this " ~A ", is that in relativity to the universal set?

yep

|dw:1348742799395:dw|

let's say A={1,2,3...}
~A={0 and all negative integers}
right?

Yes :) if A is a subset of Integers

interesting :) thanks!

if the universal set is all numbers then 1/2 is also in ~A

|dw:1348742895139:dw|

your text is missing...

S=integers
A=(1, 2,3,4 ..)
~A=(...-2, -1, 0)

oh ok, thanks :) that clears things up x
you guys are awesome :)

Glad to help :)