Variants of the de Jong fundamental group

abstract: For a rigid space $X$, we answer two questions of de~Jong about the category $\mathbf{Cov}^\mathrm{adm}_X$ of coverings which are locally in the admissible topology on $X$ the disjoint union of finite \'etale coverings: we show that this class is different from the one used by de~Jong, but still gives a tame infinite Galois category. In addition, we prove that the objects of $\mathbf{Cov}^{\text{\'et}}_X$ (with the analogous definition) correspond precisely to locally constant sheaves for the pro-\'etale topology defined by Scholze.

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Publication Details

Journal
American Journal of Mathematics
Published
2025-10-01
DOI
https://doi.org/10.1353/ajm.2025.a971095
Primary Topic
Organometallic Complex Synthesis and Catalysis
Type
article
Field-Weighted Citation Impact
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article

Variants of the de Jong fundamental group

Piotr Achinger, Marcin Lara, Alex Youcis
American Journal of Mathematics
Organometallic Complex Synthesis and Catalysis
article

Variants of the de Jong fundamental group

Piotr Achinger, Marcin Lara, Alex Youcis
article en

Abstract

abstract: For a rigid space $X$, we answer two questions of de~Jong about the category $\mathbf{Cov}^\mathrm{adm}_X$ of coverings which are locally in the admissible topology on $X$ the disjoint union of finite \'etale coverings: we show that this class is different from the one used by de~Jong, but still gives a tame infinite Galois category. In addition, we prove that the objects of $\mathbf{Cov}^{\text{\'et}}_X$ (with the analogous definition) correspond precisely to locally constant sheaves for the pro-\'etale topology defined by Scholze.

American Journal of MathematicsVol. 147(5)
Openalex Percentile: Top 79%
Organometallic Complex Synthesis and Catalysis
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