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when toggle format what by license comment
Mar 20, 2010 at 13:59 comment added Undergrad Stupid me. I missed the word 'Proper'.
Mar 20, 2010 at 13:39 comment added Willie Wong Huh? Take the set {0,1} with the discrete topology. The subsets { {0}. {1}} form a base of the topology, and they don't satisfy the conditions given in the question. Perhaps you are thinking of something else?
Mar 20, 2010 at 13:16 history answered Undergrad CC BY-SA 2.5