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what does this (~) mean in set notations?

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~A=not A or elements which are not in A
means the same as ( \(\neg\) )

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Other answers:

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

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