sasogeek
what does this (~) mean in set notations?



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UnkleRhaukus
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not

ash2326
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~A=not A
or elements which are not in A

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

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

UnkleRhaukus
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yep

UnkleRhaukus
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dw:1348742799395:dw

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

ash2326
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Yes :) if A is a subset of Integers

sasogeek
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interesting :) thanks!

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

ash2326
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dw:1348742895139:dw

sasogeek
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your text is missing...

ash2326
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S=integers
A=(1, 2,3,4 ..)
~A=(...2, 1, 0)

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

ash2326
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Glad to help :)