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Polynomials with Surjective Arboreal Galois Representations Exist in Every Degree (1803.00434v2)

Published 1 Mar 2018 in math.NT

Abstract: Let~$E$ be a Hilbertian field of characteristic~$0$. R.W.K. Odoni conjectured that for every positive integer~$n$ there exists a polynomial~$f\in E[X]$ of degree~$n$ such that each iterate~$f{\circ{k}}$ of~$f$ is irreducible and the Galois group of the splitting field of~$f{\circ k}$ is isomorphic to the automorphism group of a regular,~$n$-branching tree of height~$k.$ We prove this conjecture when~$E$ is a number field.

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