Rational preimages in families of dynamical systems

Details Rational preimages in families of dynamical systems Rational preimages in families of dynamical systems

2011-09-28

arxiv.org/abs/1109.6076v1

Mathematics

Number Theory

Scientific paper

Given a rational function of degree at least two defined over a number field k, we study the cardinality of the set of rational iterated preimages. We prove bounds for the cardinality of this set as the rational function varies in certain families. Our proofs are based on unit equations and a method of Runge for effectively determining integral points on certain affine curves. We also formulate and state a uniform boundedness conjecture for iterated preimages of rational functions and relate this conjecture to other well-known conjectures in arithmetic dynamics.

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