On the Newton’s method for transcendental functions
Kriete, Hartje
J. Math. Kyoto Univ., Tome 41 (2001) no. 4, p. 611-625 / Harvested from Project Euclid
The family of polynomials $P_{n}: \mathbb{C}\times \mathbb{C} \to \mathbb{C}; (\lambda , z) \mapsto \lambda (1 + z/n)^{n}$ converges uniformly on compact subsets of the complex plane to the family of the complex exponentials $E:\mathbb{C}\times \mathbb{C} \to \mathbb{C}; (\lambda , z) \mapsto \lambda e^{z}$, as $n$ tends to infinity. Due to this convergence certain dynamical properties of the polynomials $P_{n}(\lambda , \cdot )$ carry over to the exponentials $E(\lambda , \cdot)$. Thus it possible to study entire transcendental maps, the exponentials, by considering polynomials for which the theory is well-known. Two particular problems have received attraction: ¶ (1) For a fixed parameter $\lambda \in \mathbb{C}$ do the Julia sets of the polynomials $P_{n}(\lambda , \cdot )$ converge to the Julia set of $E(\lambda , \cdot)$? ¶ (2) Do the hyperbolic components in the parameter space of $P_{n}$ converge to hyperbolic components of the family $E$? ¶ In the present paper we study the Newton’s method associated with the entire transcendental functions $f(z) = p(z)e^{q(z)} + az + b$, with complex numbers $a$ and $b$, and complex polynomials $p$ and $q$. These functions $N_{f}$ can be approximated by the Newton’s method associated with $f_{m}(z) = p(z)(1+q(z)/m)^{m} +az +b$. In this paper we study the convergence of the Julia sets $\mathcal{J}(N_{f_{m}})\to \mathcal{J}(N_{f})$ and the Hausdorff convergence of hyperbolic components in the families $\{ N_{f_{m}}\}$ to the hyperbolic components of the family $\{ N_{f} \}$.
Publié le : 2001-05-15
Classification:  37F10,  30D05,  30D20,  37C25,  37F50,  65H05
@article{1250517620,
     author = {Kriete, Hartje},
     title = {On the Newton's method for transcendental functions},
     journal = {J. Math. Kyoto Univ.},
     volume = {41},
     number = {4},
     year = {2001},
     pages = { 611-625},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1250517620}
}
Kriete, Hartje. On the Newton’s method for transcendental functions. J. Math. Kyoto Univ., Tome 41 (2001) no. 4, pp.  611-625. http://gdmltest.u-ga.fr/item/1250517620/