| 释义 |
intrinsic coordinates (intrinsic equation) A planar curve may be defined by use of intrinsic properties such as arc length s (from some fixed point of the curve) and the angle ψ that the curve's tangent makes (with a fixed direction). The curvature κ then satisfies κ = dψ/ds and alternatively κ and s might be used to define the curve. For a curve in three dimensions, arc length, curvature, and torsion can be used.
|