Grothendieck's finite generation conjecture for punctured-spectrum fundamental groups
Let be a complete noetherian local ring with algebraically closed residue field and maximal ideal . Let be the characteristic of if it is positive and let otherwise. Assume that the irreducible components of have dimension at least , and that the scheme is connected.
Grothendieck's conjecture. The following statements hold:
- The étale fundamental group is topologically finitely generated.
- The maximal pro-prime-to- quotient of 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).
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