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(x,x] = {x}by rukawakaede
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#19
Mar2011, 04:02 PM

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http://mathworld.wolfram.com/HalfClosedInterval.html 


#20
Mar2011, 04:18 PM

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No, (3,2] is the set of all real numbers x such that 3<x≤2. There are no such real numbers. Therefore, (3,2]=∅.



#21
Mar2011, 04:55 PM

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