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“点”这个概念是我们经常接触的,在数学中几乎处处用到点,处处可以见到点的影子:线段是由无数个点组成的,它有两个端点;圆心是一个点;数轴上每一个点都表示一个实数,任何一个实数都有
The concept of “point” is something we often contact. We use dots almost everywhere in mathematics. We can see the shadow of dots everywhere: the line segment is composed of numerous points, it has two end points; the center of the circle is a point; Each point represents a real number, any real number has