Understanding why the empty set is closed – math.stackexchange.com

Understanding why the empty set is closed – math.stackexchange.com

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Definition. A set is called closed if its complement in $\mathbb{R}$ is open. In my lecture notes it says: $\emptyset$ is closed because $\emptyset = \emptyset \setminus \mathbb{R}$ and $\mathbb{R}$ ...

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