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Chasles's Contact Theorem


If a one-parameter family of curves has index N and class M, the number tangent to a curve of order n_1 and class m_1 in general position is

 m_1N+n_1M.

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References

Coolidge, J. L. A Treatise on Algebraic Plane Curves. New York: Dover, p. 436, 1959.

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Chasles's Contact Theorem

Cite this as:

Weisstein, Eric W. "Chasles's Contact Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ChaslessContactTheorem.html

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