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The concept of set

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, knowledge structure

This section first introduces the concepts of sets and elements of sets from examples involving sets in algebra and geometry in junior high school, and illustrates the concept of sets with examples. Then it introduces the common representation methods of sets, including enumeration method and description method, and gives an example of representing sets by drawing.

Second, analysis of key points and difficulties

This section focuses on the basic concepts and representations of sets, but the difficulty lies in how to use three common representations of sets to correctly represent some simple sets. This section is characterized by many concepts and symbols. Correct understanding of concepts and accurate use of symbols are the keys to learn this section well. Therefore, some topics that need to distinguish concepts and judge whether symbols represent right or wrong can be equipped in teaching to help students improve their judgment ability and deepen their understanding of the concept and representation of sets.

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