Maximal subgroups of the Harada-Norton group
In this paper the maximal subgroups of the sporadic simple Harada-Norton group HN are determined. It completes some work of \textit{K. Harada} [Proc. Conf. Finite Groups, Utah 1975, 119-276 (1976; Zbl 0353.20010)] and \textit{S. P. Norton} [Ph. D. thesis, Univ. Cambridge (1975)]. This result is also recorded in ''An ATLAS of Finite Groups'' (1985; Zbl 0568.20001)]. In this paper the complete proofs are given. The methods in the proof are standard and there is the usual division in the local and nonlocal case. Also use is made of a graph of valence 462 on 1.140.000 nodes on which HN acts.
scientific article; zbMATH DE number 3957409