Question #1463: What is a weak concept?

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Answer: First, a concept is a mental “drawing” of the shared features of a class of objects; for example, your mental drawing of a chair is your concept of a chair.   Now, a weak concept is a concept that cannot be used to achieve certainty that a given thing is a member of the class of the concept.  For example, your concept (mental drawing) of knowledge is a sentence; however, the drawing of a sentence cannot be used to achieve certainty that a given sentence is knowledge.  Another example, your concept of heat might be a set of wavy lines; however, the wavy lines cannot be used to achieve certainty that there is heat in an oven.

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