English: The end of a topological surgery: having cut two disks from a sphere, we attach a self-intersecting cylinder to get a Klein bottle. Diagram made with Mathematica 8.
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Randallbritten
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((Information |Description =((en|1=The end of a topological surgery: having cut two disks from a sphere, we attach a self-intersecting cylinder to get a Klein bottle.)) |Source =((own)) |Author =Randallbritten...
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