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单词 knot
释义
knot
Mathematics

  • A closed curve in three-dimensional space which does not intersect itself. The simplest non-trivial knot is the trefoil. Any knot is topologically equivalent (i.e. homeomorphic) to a circle, so the character of a knot is in how the circle has been embedded in space.

Computer

  • 1. An intersection of arcs in a graph that is not a planar graph. Where the arcs represent linear code sequences in a program, and the nodes represent branch points in the program, then the presence and frequency of knots is a measure of the complexity of the program (see control-flow graph).

    2. See spline.

Geology and Earth Sciences

  • Unit of speed equal to one nautical mile per hour (0.515 m/s). It is still used in many countries as a measure of wind speed and current velocity (as well as for the speed of ships and aircraft).
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