Invariable generation and totally deranged elements of simple groups

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• Scott Harper (University of Bristol)
• Friday 29 July 2022, 11:00-11:30
• Seminar Room 1, Newton Institute.

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GR2W02 - Simple groups, representations and applications

By a classical theorem of Jordan, every faithful transitive action of a nontrivial finite group admits a derangement (an element with no fixed points). More recently, the existence of derangements with additional properties has attracted much attention, especially for primitive actions of almost simple groups. Surprisingly, there exist almost simple groups with elements that are derangements in every faithful primitive action; we say that these elements are totally deranged. I’ll talk about ongoing work to classify the totally deranged elements of almost simple groups, and I’ll mention how this solves a question of Garzoni about invariable generating sets for simple groups.

This talk is part of the Isaac Newton Institute Seminar Series series.

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