Stretching Newton polygons using pure polynomials

Rylan Gajek-Leonard; Uri Tomer

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arXiv · 2405.10926

Stretching Newton polygons using pure polynomials

Rylan Gajek-Leonard·Uri Tomer

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Abstract

The $p$-adic Newton polygon is a visual tool that encodes information about the roots and factorization of a polynomial relative to a prime $p$. In this article, we investigate how the Newton polygon changes under polynomial composition. If $f$ and $g$ are polynomials with rational (or $p$-adic) coefficients and the Newton polygon of $g$ is pure (has only one segment), we show under some mild conditions that the Newton polygon of $f\circ g$ is the same as that of $f$, but stretched horizontally by $\operatorname{deg}(g)$. When $f=g$, this implies that all iterates of certain pure polynomials are irreducible, recovering a classical result of Robert Odoni on the irreducibility of iterated Eisenstein polynomials.

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Rylan Gajek-Leonard, Uri Tomer. 2024-05-17. Stretching Newton polygons using pure polynomials. https://arxiv.org/abs/2405.10926

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