Abstract
The 2-closure \(\overline{G}\) of a permutation group G on \(\Omega\) is defined to be the largest permutation group on \(\Omega\), having the same orbits on \(\Omega \times \Omega\) as G. It is proved that ifG is supersolvable, then \(\overline{G}\) can be found in polynomial time in \(|\Omega|\). As a by-product of our technique, it is shown that the composition factors of \(\overline{G}\) are cyclic or alternating.
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Acknowledgements
The authors thank S. V. Skresanov and E. P. Vdovin for fruitful discussions and useful comments to the first draft of the paper, and are grateful to the anonymous referee for suggestions improving the presentation.
The work was partially supported by the RFBR Grant No. 18-01-00752, and by Mathematical Center in Akademgorodok under agreement No. 075-15-2019-1613 with the Ministry of Science and Higher Education of the Russian Federation.
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Ponomarenko, I., Vasil’ev, A. Two-closures of supersolvable permutation groups in polynomial time. comput. complex. 29, 5 (2020). https://doi.org/10.1007/s00037-020-00195-7
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DOI: https://doi.org/10.1007/s00037-020-00195-7