Ephraim's Pencils

Details Ephraim's Pencils Ephraim's Pencils

2011-10-17

arxiv.org/abs/1110.3589v1

Mathematics

Algebraic Geometry

Scientific paper

Let $f(x,y)=0$ and $l(x,y)=0$ be respectively a singular and a regular analytic curve defined in the neighborhood of the origin of the complex plane. We study the family of analytic curves $f(x,y)-tl(x,y)^M=0$, where $t$ is a complex parameter. For all but a finite number of parameters the curves of this family have the same embedded topological type. The exceptional parameters are called special values. We show that the number of nonzero special values does not exceed the number of components of the curve $f(x,y)=0$ counted without multiplicities. Then we apply this result to estimate the number of critical values at infinity of complex polynomials in two variables.

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