Geodesic
Abstract Definitions for the Mathieu Groups M11and M12
Canadian mathematical bulletin, Tome 2 (1959) no. 1, pp. 9-13

Voir la notice de l'article provenant de la source Cambridge University Press

A list of known finite simple groups has been given by Dickson [3, 4]. With but five exceptions, all of them fall into infinite families. The five exceptional groups, discovered by Mathieu [8,9], were further investigated by Jordan [7], Miller [10], de Séguier [11], Zassenhaus [13], and Witt [12]. In Witt's notation they are M11, M12, M22, M23, M24. Generators for them may be seen in the book of Carmichael [1, pp. 151, 263, 288]; but only for the smallest of them, M11 of order 7920, has a set of defining relations been given. 
Moser, W.O.J. Abstract Definitions for the Mathieu Groups M11and M12. Canadian mathematical bulletin, Tome 2 (1959) no. 1, pp. 9-13. doi: 10.4153/CMB-1959-003-0
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