For a type of special barflies, said to be simplified, it is shown that two simplified barflies of different sizes are not basic equivalent and that any nonorientable map is basic equivalent to one of the simplified barflies.

  • 对于一类特殊的魔,称为简魔,论证了棱数不同的简魔不可能初等等价,任何一个不可定向地图都与某个简魔初等等价。

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