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## Main Question or Discussion Point

I don't quite understand the meaning of "

Is an infinite union

∞

U A

k=1

being

lim (A

n->∞

How about an infinite intersection?

Thanks!

**infinite**union" and "**infinite**intersection".Is an infinite union

∞

U A

_{k}k=1

being

__defined__as a limitlim (A

_{1}U A_{2}U ... U A_{n}) ???n->∞

How about an infinite intersection?

Thanks!