A ribbon knot which is not a symmetric union
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🧮 math.GT
keywords
knotribbonsymmetricunionquestionadmitanswerarticle
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A basic open question motivated by the study of ribbon knot diagrams asks whether every ribbon knot can be presented as a symmetric union. In this article, we give a negative answer to this question by exhibiting a ribbon Montesinos knot which does not admit a symmetric union presentation.
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