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

About 4 years old · traced to

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 Spec⁡A\operatorname{Spec} A have dimension at least 22, and that the scheme Spec⁡A∖{m}\operatorname{Spec} A \setminus \{\mathfrak{m}\} is connected.

Grothendieck's conjecture. The following statements hold:

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

References

Primary source

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

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.