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平面上有到(1,0),(1,1),(0,1),(0,0)四个点距离均为有理数的的点嘛?
这是 Square Four-Distance 问题,目前是个未解问题. 是否存在一点,它到平面上到单位正方形的所有顶点 (1,0), (1,1), (0,1), (0,0) 的距离均为有理数?
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