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arXiv · 2102.11699

Fermat's Last Theorem and modular curves over real quadratic fields

Philippe Michaud-Jacobs
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Abstract

In this paper we study the Fermat equation $x^n+y^n=z^n$ over quadratic fields $\mathbb{Q}(\sqrt{d})$ for squarefree $d$ with $26 \leq d \leq 97$. By studying quadratic points on the modular curves $X_0(N)$, $d$-regular primes, and working with Hecke operators on spaces of Hilbert newforms, we extend work of Freitas and Siksek to show that for most squarefree $d$ in this range there are no non-trivial solutions to this equation for $n \geq 4$.

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Philippe Michaud-Jacobs. 2021-02-23. Fermat's Last Theorem and modular curves over real quadratic fields. https://doi.org/10.4064/aa210812-2-4

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