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What do extension and connotation mean in mathematics?
When learning concepts, you will say this.

The extension of the concept is the scope of all objects that apply to this concept, and the connotation of the concept is the sum of the essential attributes of the objects reflected by this concept. For example, the concept of "parallelogram" includes all squares, diamonds, rectangles and general parallelograms, while its connotation includes the two essential attributes that all parallelograms have "four sides and two groups of opposite sides are parallel to each other".