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Hurwitz Generation in Groups of Types F₄, E₆, ²E₆, E₇ and E₈

27 Mar 2020arXiv:2003.12595links table onlyarchive 2025-07-28

Emilio Pierro

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A Hurwitz generating triple for a group G is an ordered triple of elements (x,y,z) ∈G³ where x²=y³=z⁷=xyz=1 and ⟨x,y,z ⟩= G. For the finite quasisimple exceptional groups of types F₄, E₆, ²E₆, E₇ and E₈, we provide restrictions on which conjugacy classes x, y and z can belong to if (x,y,z) is a Hurwitz generating triple. We prove that there exist Hurwitz generating triples for F₄(3), F₄(5), F₄(7), F₄(8), E₆(3) and E₇(2), and that there are no such triples for F₄(2³ⁿ⁻²), F₄(2³ⁿ⁻¹), E₆(7³ⁿ⁻²), E₆(7³ⁿ⁻¹), SE₆(7ⁿ) or ²E₆(7ⁿ) when n ≥1.

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