A curve which has at least multiplicity at each point where a given curve (having only ordinary singular points and cusps) has a multiplicity is called the adjoint to the given curve. When the adjoint curve is of order , it is called a special adjoint curve.

**References**

Coolidge, J. L. *A Treatise on Algebraic Plane Curves.* New York: Dover, p. 30, 1959.

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1999-05-25