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contact point

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Let $\phi$ be a planar dynamical system and $\gamma$ a curve.  Then a \emph{contact point} of the curve and the dynamical system occurs when the tangent vector of the curve is collinear to the vector of the dynamical system.
\bibitem[KGA]{1} Khovanski\u\i, A.G.: Fewnomials. American Mathematical Society, Providence, 1991.