Concept explainers
Brunnian links (H). Link four loops together in such a way that they are all linked and yet the removal of any one loop will unlink all the others. This gene ralization of the Borromean rings is called the Brunnian links. Can you link five loops together in this fashion? Can you link any number together in this way? (Hint. The loops need not be round circles. Make the Borromean rings out of rubber bands, cutting and re-gluing one. Now move them around.)
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