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some help on sets, please! |
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| Jun15-04, 04:58 AM | #1 |
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some help on sets, please!
can anyone tell me the answer to this??
if U (universal set) = {1,2,3,4,5,6,7,8,9,10,11,12,13,14} C (just a simple subset of the universal set U)= {1,2,3,4,5} then what would be the answer if: C U U' ????? (subset C union universal set complement) thanks !!sorry for the double post!! please delete this one!!! |
| Jun17-04, 11:06 PM | #2 |
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Don't you need to also include your universe of discourse?
If your universe of discourse is the natural numbers then,... C U U' would be {1,2,3,4,5} U {15,16,17,...} If your universe of discourse is the integers then,... C U U' would be {... -3,-2,-1,0} U {1,2,3,4,5} U {15,16,17,...} For other universes of discourse it could get ugly. :surprise: Edited to add the following possibility,... If your universe of discourse is U then U' is the empty set so,... C U U' would be just be {1,2,3,4,5} |
| Jun20-04, 07:03 PM | #3 |
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Neutron star: the original post said "U (universal set) = 1,2,3,4,5,6,7,8,9,10,11,12,13,14}.
That is the "unverse of discourse". |
| Jun20-04, 08:04 PM | #4 |
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some help on sets, please!I would agree that they are technically incorrect in doing this. But they seem to do it quite often just the same. I've actually confronted a college professor about this once and all I got in return was a lecture on the difference between a universal set and the universe of discourse. Don't look at me. I'm with you! As far as I'm concerned professors and authors who think there is a difference are wrong. But since its an imperfect universe (no pun intended) I like to cover all my bases.
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