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一、引言A.F.M(?)bius(或 Moebius)是德国数学家。M(?)bius 带的简单模型可用一条纸带将一端扭转180°,然后将两端粘接起来表示。这样形成的带,既没有内面,也没有外面,内面和外面相结合形成一个连续状态,成为具有一个边一个
I. Introduction A.F.M (?) Bius (or Moebius) is a German mathematician. The simple model of the M (?) Bius band can be twisted 180 ° with one piece of tape and glued together at both ends. The belt thus formed has neither inner nor outer surface, and the inner surface and the outer surface are combined to form a continuous state so as to have one side