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 it is both necessary and sufficient that something (1) be a polygon and (2) have three sides for it to be a triangle.
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 it is both necessary and sufficient that something (1) be a polygon and (2) have three sides for it to be a triangle.
Source: Wikipedia "Closed concept" · CC BY-SA 4.0
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