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arXiv · 2607.23129

Finite length for unramified $\mathrm{GL}_2$: beyond multiplicity one, non-semisimple case

Lucrezia Bertoletti
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Abstract

Let $p$ be a prime number and $K$ a finite unramified extension of $\mathbb{Q}_p$. We study the smooth mod $p$ representations of $\mathrm{GL}_2(K)$ appearing in a tower of mod $p$ Hecke eigenspaces of the cohomology of Shimura curves, under mild genericity assumptions but notably no multiplicity one assumption at tame level, and prove that they are of finite length, thereby extending some recent results of Breuil, Herzig, Hu, Morra and Schraen to higher multiplicity. In a previous companion article we investigated the case where the local Galois representation attached to the Hecke eigensystem is semisimple; this article treats the non-semisimple case.

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Lucrezia Bertoletti. 2026-07-25. Finite length for unramified $\mathrm{GL}_2$: beyond multiplicity one, non-semisimple case. https://arxiv.org/abs/2607.23129

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