June 27th, 2011, 04:51 AM  #1 
Newbie Joined: Nov 2010 Posts: 27 Thanks: 0  Set notations I am told that U=union and ?=intersection So i know that AUB' means all numbers that are in a but not in B but why does A'UB' = the numbers in the intersection? I assumed that it would mean all numbers that are in neither A or B. Same goes for A'?B' I though that meant all numbers that are not the intersection of A and B. Could someone please explain (preferably in layman terms) Thank You! 
June 27th, 2011, 05:24 AM  #2 
Senior Member Joined: Jun 2011 Posts: 298 Thanks: 0  Re: Set notations means the element is either outside or outside . If you hatch the region outside with diagonal lines directed from lower left to upper right, and hatch outside from upper left to lower right, you will find the crosshatch in the region where and overlap each other. That's by Venn Diagram. 
June 27th, 2011, 07:27 AM  #3  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: Set notations Hello, sallyyy! Quote:
This has a UNION. means all numbers that are in A [color=blue]or[/color] not in B. It would be everything except the light blue region. Quote:
Once again, this is a UNION. means numbers that are not in A [color=blue]or[/color] not in B. It would be everything except the dark blue region. Quote:
means numbers which are not in A [color=blue]and[/color] not in B. It would be the white region (outside the two circles).  
June 27th, 2011, 05:46 PM  #4 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0 
Let the left circle be A and right circle be B. A?B A ?B A?B' A'?B' A'?B' 
June 30th, 2011, 06:34 PM  #5  
Senior Member Joined: Apr 2011 From: USA Posts: 782 Thanks: 1  Re: Set notations Quote:
 

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