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Span (Link)

The span of an unoriented Link diagram (also called the 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 $4n$.

See also Link

© 1996-9 Eric W. Weisstein