On the solutions of the generalized Fermat equation over totally real number fields

Satyabrat Sahoo

Published 2024-04-14Version 1

Let $K$ be a totally real number field, and $ \mathcal{O}_K$ be the ring of integers of $K$. In this article, we study the asymptotic solutions of the generalized Fermat equation, i.e., $Ax^p+By^p+Cz^p=0$ over $K$ of prime exponent $p$, where $A,B,C \in \mathcal{O}_K \setminus \{0\}$ with $ABC$ is even (in the sense that $\mathfrak{P}| ABC$, for some prime ideal $\mathfrak{P}$ of $ \mathcal{O}_K$ with $\mathfrak{P} |2$). For certain class of fields $K$, we prove that the equation $Ax^p+By^p+Cz^p=0$ has no asymptotic solution in $K^3$ (resp., of certain type in $K^3$), under some assumptions on $A,B,C$ (resp., for all $A,B,C \in \mathcal{O}_K \setminus \{0\}$ with $ABC$ is even). We also present several purely local criteria of $K$ such that $Ax^p+By^p+Cz^p=0$ has no asymptotic solutions in $K^3$.