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Correspondences in complex dynamics (1710.03385v1)

Published 10 Oct 2017 in math.DS

Abstract: This paper surveys some recent results concerning the dynamics of two families of holomorphic correspondences, namely ${\mathcal F}_a:z \to w$ defined by the relation $$\left( \frac{aw-1}{w-1} \right)2 + \left( \frac{aw-1}{w-1} \right) \left( \frac{az +1}{z+1} \right) + \left( \frac{az+1}{z+1} \right)2 =3,$$ and $$\mathbf{f}_c(z)=z{\beta} +c, \mbox{ where } 1<\beta=p/q \in \mathbb{Q},$$ which is the correspondence $\mathbf{f}_c:z \to w$ defined by the relation $$(w-c)q=zp.$$ Both can be regarded as generalizations of the family of quadratic maps $f_c(z)=z2+c$. We describe dynamical properties for the family $\mathcal{F}_a$ which parallel properties enjoyed by quadratic polynomials, in particular a B\"ottcher map, periodic geodesics and Yoccoz inequality, and we give a detailed account of the very recent theory of holomorphic motions for hyperbolic multifunctions in the family ${\bf f}_c$.

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