On p-stability in groups and fusion systems

L. Héthelyi, M. Szőke, A.E. Zalesski

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The aim of this paper is to generalise the notion of p-stability (p is an odd prime) in finite group theory to fusion systems. We first compare the different definitions of p-stability for groups and examine properties of p -stability concerning subgroups and factor groups. Motivated by Glauberman's theorem, we study the question of how Qd(p) is involved in finite simple groups. We show that with a single exception a simple group involving Qd(p) has a subgroup isomorphic to either Qd(p) or a central extension of Qd(p) by a cyclic group of order p. Then we define p-stability for fusion systems and characterise some of its properties. We prove a fusion theoretic version of Thompson's maximal subgroup theorem. We introduce the notion of section p-stability both for groups and fusion systems and prove a version of Glauberman's theorem to fusion systems. We also examine relationship between solubility and p -stability for fusion systems and determine the simple groups whose fusion systems are Qd(p)-free.
Original languageEnglish
Pages (from-to)253-297
Number of pages45
JournalJournal of Algebra
Early online date6 Sep 2017
Publication statusPublished - 15 Dec 2017


  • Finite simple groups
  • Simple groups of Lie type
  • Saturated fusion systems
  • Soluble fusion systems
  • p-stability
  • Qd(p)-free groups and fusion systems

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