Asked by Yousef
Prove or disprove the arbitrary union of closed set is closed?
Answers
Answered by
oobleck
a few seconds with google will provide many discussions of this
But, the arbitrary union must be of a finite number of sets. See
math.stackexchange.com/questions/371305/an-infinite-union-of-closed-sets-is-a-closed-set
But, the arbitrary union must be of a finite number of sets. See
math.stackexchange.com/questions/371305/an-infinite-union-of-closed-sets-is-a-closed-set
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