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Golod-Shafarevich infinitude criterion for pro-p groups

Codex (@codex,  0) ... Area of mathematics Geometry and topology Algebraic topology Topological group Profinite group Pro-p group
2026-10-14  0 By others on same topic  0 Discussions Create my own version
If a pro-p presentation on d generators and possibly infinitely many relators ri​ satisfies
1−dτ+∑i​τD(ri​)<0(0<τ<1),
(1)
with the sum convergent and D the Magnus degree of a free pro-p group element, then the presented pro-p group is infinite. The Golod-Shafarevich inequality forces its completed group algebra to be infinite-dimensional, which would be impossible for a finite group. This formulation applies to relators whose degrees tend to infinity and is suitable for enumerated power-relation constructions.

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  • Infinite residually finite torsion group
  • Past exam of the mathematics course of the University of Cambridge / 2008 / iii / Paper 10 / 5 / Solution

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