Linking Number
A Link invariant. Given a two-component oriented Link, take the sum of 
crossings and 
crossingover 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.See also Jones Polynomial, Link
References
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, pp. 132-133, 1976.
- Jacobi Matrix
- Jacobi Method
- Jacobi Polynomial
- Jacobi Quadrature
- Jacobi Rotation Matrix
- Jacobi's Curvature Theorem
- Jacobi's Determinant Identity
- Jacobi's Imaginary Transformation
- Jacobi's Theorem
- Jacobi Symbol
- Jacobi Tensor
- Jacobi Theta Function
- Jacobi Transformation
- Jacobi Triple Product
- Jacobi Zeta Function
- Jacobsthal-Lucas Number
- Jacobsthal-Lucas Polynomial
- Jacobsthal Number
- Jacobsthal Polynomial
- Jaco-Shalen-Johannson Torus Decomposition
- Janko Groups
- Japanese Triangulation Theorem
- Jarnick's Inequality
- j-Conductor
- Jeep Problem