How to determine which sets are open in a topology? – math.stackexchange.com

Given $A_n = \{n, n+1, \dots\} , n \in \mathbb{N} $ and $\tau = \{ \emptyset, A_1, A_2, \dots \} $, I would like to determine which sets are open in $(\mathbb{N}, \tau) $ By definition: $A_n$ is open ...

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