This proves that simple groups may possess C-group representations, highlighting exceptions among notable groups.
We prove that a simple group admits at least one string C-group representation if and only if it is not one of PSL(3, q), PSU(3, q), PSL(4, 2n), PSU(4, 2n), PSU(4, 3), PSU(5, 2), A₆, A₇, M₁₁, M₂₂, M₂₃ or McL.
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Leemans et al. (2025) studied this question.