A closed concept is a concept where all the necessary and sufficient conditions required to include something within the concept can be listed. For example, the concept of a triangle is closed because a three-sided polygon, and only a three-sided polygon, is a triangle. All the conditions required to call something a triangle can be, and are, listed.
- Open and Closed Concepts and the Continuum Fallacy - More on open and closed concepts
- Necessary Conditions and Sufficient Conditions - A guide to the usage and application of necessary and sufficient conditions
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