info prev up next book cdrom email home

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
1999-05-26