In any science, in any discipline there are moments that can be called turning points — they reinvigorate and deepen the understanding of the subject at hand. What exactly is a turning point, even among friends, is usually contested and debated feverishly. Knot theory also has many turning points; however, there are two that are beyond debate: the Alexander polynomial and the Jones polynomial.
KeywordsPlane Graph Euler Characteristic Orientable Surface Closed Curf Simple Closed Curve
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