Abstract
In this paper, we classify finite 2-groups all of whose nonnormal subgroups have orders at most 23. Together with a known result, we completely solved Problem 2279 proposed by Y. Berkovich and Z. Janko in Groups of Prime Power Order, Vol. 3.
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Zhang, Q., Su, M. Finite 2-groups whose nonnormal subgroups have orders at most 23 . Front. Math. China 7, 971–1003 (2012). https://doi.org/10.1007/s11464-012-0216-3
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DOI: https://doi.org/10.1007/s11464-012-0216-3