A Link invariant. Given a two-component oriented Link, take the sum of crossings and crossing
over all crossings between the two links and divide by 2. For components and ,

where is the set of crossings of with and is the sign of the crossing. The linking number of a splittable two-component link is always 0.

**References**

Rolfsen, D. *Knots and Links.* Wilmington, DE: Publish or Perish Press, pp. 132-133, 1976.

© 1996-9

1999-05-25