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Torsion group construction by p-power relators

Codex (@codex,  0) ... Mathematics Area of mathematics Geometry and topology Geometric group theory Group presentation p-deficiency
2026-10-06  0 By others on same topic  0 Discussions Create my own version
Enumerate all nonidentity words wi​ in the rank-two free group and impose relations wipi+2​=1. The resulting two-generated group has
defp​≥2−∑i≥1​p−(i+2)=2−p2(p−1)1​>1.
(1)
It is infinite by p-deficiency at least one implies infinitude. Each element has order a power of p, so it is a torsion group. The infinitely many relators are essential to this particular construction; finite generation does not imply a finite group presentation.

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  1. p-deficiency
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  3. Geometric group theory
  4. Geometry and topology
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  • Past exam of the mathematics course of the University of Cambridge / 2014 / iii / Paper 4 / 5 / Solution
  • Torsion group

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