



Fundamentals Give an example of a set that is neither open nor closed.
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what is an open set in topology Informational
- Examples What is the quotient topology?
- Applications Does the concept of an open set have any relevance in the mathematical description of topological insulators?
- Differential Geometry What is a homogeneous space?
- Related Concepts How are open sets used to define a Hausdorff space?
- Related Concepts What is a proper subset?
- Real Line
- Related Fields What is an open domain in complex analysis?
- Alternative Definitions
- Density How are open sets related to nowhere dense sets?
- Fundamentals Can an open set be a proper subset of another open set?
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