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