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May
15
awarded  Supporter
Dec
6
comment Which group is meant by $\mathbb Z/2 \times \mathbb Z/2.$
Yes, it is the same group. The $\times$ means that you take the product set with componentwise operations, and the product and direct sum of two abelian groups are the same.
Nov
5
awarded  Teacher
Nov
5
answered Can $\Bbb N$ be topologized to be a compact Hausdorff space?