Grothendieck's finite generation conjecture for punctured-spectrum fundamental groups

Let AA be a complete noetherian local ring with algebraically closed residue field FF and maximal ideal m\mathfrak{m}. Let pp be the characteristic of FF if it is positive and let p=1p = 1 otherwise. Assume that the irreducible components of SpecA\operatorname{Spec} A have dimension at least 22, and that the scheme SpecA{m}\operatorname{Spec} A \setminus \{\mathfrak{m}\} is connected.

Grothendieck's conjecture. The following statements hold:

  1. The étale fundamental group π1(SpecA{m})\pi_{1}(\operatorname{Spec} A \setminus \{\mathfrak{m}\}) is topologically finitely generated.
  2. The maximal pro-prime-to-pp quotient of π1(SpecA{m})\pi_{1}(\operatorname{Spec} A \setminus \{\mathfrak{m}\}) is topologically finitely presented.

The conjecture, made in SGA 2, concerns the finiteness properties of the étale fundamental group of a punctured spectrum. The paper proves the weaker assertion that the maximal pro-nilpotent quotient is topologically finitely generated, so the two stated finiteness claims remain unresolved here.

Sources & referencesView supporting material

Primary source

Takashi Suzuki, “Finite generation of nilpotent quotients of fundamental groups of punctured spectra”, arXiv:2207.01563 (2023).

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