Abstract
Let \({\mathcal {D}}\) be a nontrivial 3-(v, k, 1) design admitting a block-transitive group G of automorphisms. A recent work of Gan and the second author asserts that G is either affine or almost simple. In this paper, it is proved that if G is almost simple with socle an alternating group, then \({\mathcal {D}}\) is the unique 3-(10, 4, 1) design, and \(G=\textrm{PGL}(2,9)\), \(\textrm{M}_{10}\) or \(\textrm{Aut}(\textrm{A}_6 )=\textrm{S}_6:\textrm{Z}_2\), and G is flag-transitive.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (12071484,12271524,12071023,11971054). The authors are very grateful for the anonymous referees’ valuable comments to improve the paper.
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Lan, T., Liu, W. & Yin, FG. Block-transitive 3-(v, k, 1) designs associated with alternating groups. Des. Codes Cryptogr. 91, 2791–2807 (2023). https://doi.org/10.1007/s10623-023-01215-7
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DOI: https://doi.org/10.1007/s10623-023-01215-7