| 释义 |
Humbert's TheoremThe Necessary and Sufficient condition that an algebraic curve has an algebraic Involute is that theArc Length is a two-valued algebraic function of the coordinates of the extremities. Furthermore, this functionis a Root of a Quadratic Equation whose Coefficients are rational functions of and . References
Coolidge, J. L. A Treatise on Algebraic Plane Curves. New York: Dover, p. 195, 1959.
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