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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- September 24th 2011, 10:14 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 - September 24th 2011, 10:25 AMPlatoRe: Topology on X
- September 24th 2011, 11:19 AMdwsmithRe: Topology on X
- September 24th 2011, 11:37 AMPlatoRe: Topology on X