Sequence of invariants for knots and links

Abstract
The Alexander polynomial or Conway's potential for a knot or a link is presented from a different point of view, thus supplying a new proof of their invariance. The quicker method so arrived at of calculating these invariants may be of interest for applications in polymer physics. The invariant is shown to factorize into contributions from its tangles. Its relation to the much used Gauss' winding number is indicated

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