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model theory 1permutation groups 1sharp transitivity 1ultrahomogeneous structures 1virtually free groups 1

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20242026
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math.GR2026

Two generalisations of sharp k-transitivity

J. de la Nuez González, Rob Sullivan

The paper introduces two extensions of sharply k‑transitive group actions—one based on subgroups of the symmetric group and another on relational structures—and determines when suc…