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 March 10th, 2011, 01:33 PM #1 Member   Joined: Nov 2010 Posts: 78 Thanks: 0 Set Recursive Definitions Please help me with the following question about unions and intersections: Given sets A1,A2,A3,...., develop recursive definitions for U from j=1 to k of Aj and Intersection from j=1 to k of Aj Need to find and prove an extension of De Morgan's laws for these unions and intersections. Thank you in advance for the help!
 March 10th, 2011, 02:01 PM #2 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms Re: Set Recursive Definitions Moved to Set Theory.
 March 12th, 2011, 05:44 AM #3 Senior Member   Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3 Re: Set Recursive Definitions How do you add numbers a+b+c+d+...+k ? Can you do the same thing with the union of sets?

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