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映射是近代数学的一个基本概念,它反映着集合间元素的对应关系,虽然教学大纲只要求从直观上了解映射概念,但还是应该清楚以下几点:
Mapping is a basic concept of modern mathematics, which reflects the correspondence between the elements of the collection. Although the syllabus only requires intuitive understanding of mapping concepts, it should be clear that: