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The author has 2 posts.

我认为在三维空间中任意选取五个点并两两相连画正五胞体更好些

Floor 1 4Der 4/19/11 12:43
就好比四维生物在三维平面上画正五胞体
Floor 2 4Der 4/19/11 12:44
在纸上画四面体可以发现有一条棱与另一条棱相交,但实际上他们根本就没有相交。

同样在三维平面上画正五胞体会发现有一条棱与一个平面相交,但实际上在四维空间他们根本没有相交

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