
Re: Countably Infinite Sets
Posted:
Dec 27, 2012 9:56 PM


On Thu, 27 Dec 2012, netzweltler wrote:
> Does the set {{1}, {1,2}, {1,2,3}, ...} contain all natural numbers?
No, it contains subsets of N, the set of positive integers.
On the other hand, the great union of your set is N.

