On the Casson knot invariant
classification
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invariantknotcassoncombinatorialconfigurationdegreedegreesformulas
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We study the Vassiliev knot invariant v_2 of degree 2. We present it via the degrees of maps of various configuration spaces related to a knot to products of spheres. This gives rise to numerous geometrical and combinatorial formulas for this invariant.
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