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December 2nd, 2008, 01:04 PM  #1 
Newbie Joined: Nov 2008 Posts: 13 Thanks: 0  discrete topology, product topology
For each , let be the set , and let be the discrete topology on . For each of the following subsets of , say whether it is open or closed (or neither or both) in the product topology. (a) (b) (c) (d) (e) Recall that 

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