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.
- Number Group
- Number Guessing
- Number Pyramid
- Number System
- Number Theoretic Transform
- Number Theory
- Number Triangle
- Number Wall
- Numerator
- Numerical Derivative
- Numerical Integration
- Numeric Function
- Numerology
- NURBS Curve
- NURBS Surface
- Nyquist Frequency
- Nyquist Sampling
- Néron-Severi Group
- Nöther
- Obelus
- Object
- Oblateness
- Oblate Spheroid
- Oblate Spheroidal Coordinates
- Oblate Spheroidal Wave Function