Bridge Index
A numerical Knot invariant. For a Tame Knot 
, the bridge index is the least Bridge Number of allplanar representations of the Knot. The bridge index of the Unknot is defined as 1.
References
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, p. 114, 1976. Schubert, H. ``Über eine numerische Knotteninvariante.'' Math. Z. 61, 245-288, 1954.
- Johnson's Equation
- Johnson Solid
- Johnson's Theorem
- Join (Graph)
- Join (Spaces)
- Joint Distribution Function
- Joint Probability Density Function
- Joint Theorem
- Jonah Formula
- Jones Polynomial
- Jonquière's Function
- Jordan Algebra
- Jordan Curve
- Jordan Curve Theorem
- Jordan Decomposition Theorem
- Jordan-Hölder Theorem
- Jordan Measure
- Jordan Polygon
- Jordan's Inequality
- Jordan's Lemma
- Josephus Problem
- Jug
- Jugendtraum
- Juggling
- Julia Fractal