Link Span

The span of an unoriented link diagram (also called the link spread) is the difference between the highest and lowest degrees of its bracket polynomial. The span is a topological invariant of a knot. If a knot K has a reduced alternating projection of n crossings, then the span of K is 4n.

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Weisstein, Eric W. "Link Span." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/LinkSpan.html

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