
#19
Mar2011, 04:02 PM

P: 2,490

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



#20
Mar2011, 04:18 PM

Emeritus
Sci Advisor
PF Gold
P: 8,992

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

P: 2,490




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