Sporadic groups

Mathieu group

In group theory, a topic in abstract algebra, the Mathieu groups are the five sporadic simple groups M11, M12, M22, M23 and M24 introduced by Mathieu . They are multiply transitive permutation groups on 11, 12, 22, 23 or 24 objects. They were the first sporadic groups to be discovered. Sometimes the notation M9, M10, M20 and M21 is used for related groups (which act on sets of 9, 10, 20, and 21 points, respectively), namely the stabilizers of points in the larger groups. While these are not sporadic simple groups, they are subgroups of the larger groups and can be used to construct the larger ones. John Conway has shown that one can also extend this sequence up, obtaining the Mathieu groupoid M13 acting on 13 points. M21 is simple, but is not a sporadic group, being isomorphic to PSL(3,4). (Wikipedia).

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Related pages

Monster group | Vector space | Finite field | Mathieu group M12 | Mathieu group M23 | Affine geometry | Miracle Octad Generator | Up to | John Horton Conway | Almost simple group | Permutation group | Steiner system | Mathieu groupoid | Symmetric group | Zassenhaus group | Alternating group | Automorphisms of the symmetric and alternating groups | Generating set of a group | Leech lattice | Janko group J1 | Classification of finite simple groups | Binary Golay code | Mathieu group M11 | Group theory | Mathieu group M24 | Mathieu group M22 | Equivalence relation | Jordan's theorem (symmetric group) | Abstract algebra | Commutator subgroup | Quaternion group