Difference between revisions of "Writhe"
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Latest revision as of 16:03, 21 September 2016
In knot theory, there are several competing notions of the quantity writhe, or Wr.
Description
In one sense, it is purely a property of an oriented link diagram and assumes integer values.
In another sense, it is a quantity that describes the amount of "coiling" of a mathematical knot (or any closed, simple curve) in three-dimensional space and assumes real numbers as values.
In both cases, writhe is a geometric quantity, meaning that while deforming a curve (or diagram) in such a way that does not change its topology, one may still change its writhe.
See also
- DNA supercoiling
- Knot (mathematics)
- Knot theory
- Link (knot theory)
- Linking number
- Ribbon theory
- Twist (mathematics)
- Winding number
External links
- Writhe @ Wikipedia
