An natural equation which expresses a curve in terms of its arc length 
and tangential angle 
.
Whewell Equation
See also
Arc Length, Cesàro Equation, Natural Equation, Tangential AngleExplore with Wolfram|Alpha
References
Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 4-5, 1972.Yates, R. C. "Intrinsic Equations." A Handbook on Curves and Their Properties. Ann Arbor, MI: J. W. Edwards, pp. 123-126, 1952.Referenced on Wolfram|Alpha
Whewell EquationCite this as:
Weisstein, Eric W. "Whewell Equation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/WhewellEquation.html