Papers › Dynatomic Galois groups for a family of quadratic rational maps

Dynatomic Galois groups for a family of quadratic rational maps

10 Mar 2023arXiv:2303.05632links table onlyarchive 2025-07-28

David Krumm, Allan Lacy

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For every nonconstant rational function ϕ∈ℚ(x), the Galois groups of the dynatomic polynomials of ϕ encode various properties of ϕ that are of interest in the subject of arithmetic dynamics. We study here the structure of these Galois groups as ϕ varies in a particular one-parameter family of maps, namely the quadratic rational maps having a critical point of period 2. In particular, we provide explicit descriptions of the third and fourth dynatomic Galois groups for maps in this family.

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