Problem

Criticize the following “proof” that if {Aα}is a collection of sets in X and if  then eve...

Criticize the following “proof” that if {Aα}is a collection of sets in X and if  then every neighborhood U of x intersects UAα. Thus U must intersect some Aa, so that x must belong to the closure of some Aα. Therefore, .

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Solutions For Problems in Chapter 2.17