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A proper arithmetic surface with infinite étale fundamental group

Pablo Chenal

Source record

Source: arXiv

Published: Oct 5, 2026

arXiv: 2610.05972

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Source abstract

We give an example of a proper, regular, integral arithmetic surface over Spec Z\mathrm{Spec}\ \Z endowed with a section, and whose étale fundamental group admits an infinite pro-22 quotient. The construction is a geometric analog of the Golod--Shafarevich towers for rings of integers of number fields.

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A proper arithmetic surface with infinite étale fundamental group — Mathematical Frontier Network