笛卡尔积的几何解释,两圆�(圆环面),圆�与圆环(实圆环)为什么?这两个集合(圆环面和实圆环)的笛卡尔正方形对角线的几何解释是什么? 知乎 Template




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tomski笛卡尔积的几何解释,两圆�(圆环面),圆�与圆环(实圆环)为什么?这两个集合(圆环面和实圆环)的笛卡尔正方形对角线的几何解释是什么? 知乎 coloring