Consider the set

The collection of subsets are

The book says the one point set is not closed because its complement is not open. What is the complement of

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- Sep 24th 2011, 09:14 AMdwsmithTopology on X
Consider the set

The collection of subsets are

The book says the one point set is not closed because its complement is not open. What is the complement of - Sep 24th 2011, 09:25 AMPlatoRe: Topology on X
- Sep 24th 2011, 10:19 AMdwsmithRe: Topology on X
- Sep 24th 2011, 10:37 AMPlatoRe: Topology on X