为什么函数极限的定义要求在去心邻域有定义,而函数连续定义中却要求函数在一点的邻域有定义? 知乎 Template




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tomski为什么函数极限的定义要求在去心邻域有定义,而函数连续定义中却要求函数在一点的邻域有定义? 知乎 coloring