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Mathieu group M12
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Mathieu group M12 : ウィキペディア英語版
Mathieu group M12

In the area of modern algebra known as group theory, the Mathieu group ''M12'' is a sporadic simple group of order
:   2633511 = 95040 = 12×11×10×9×8
: ≈ 1.
==History and properties==
''M12'' is one of the 26 sporadic groups and was introduced by . It is a sharply 5-transitive permutation group on 12 objects. showed that the Schur multiplier of M12 has order 2 (correcting a mistake in where they incorrectly claimed it has order 1).
The double cover had been implicitly found earlier by , who showed that M12 is a subgroup of the projective linear group of dimension 6 over the finite field with 3 elements.
The outer automorphism group has order 2, and the full automorphism group M12.2 is contained in M24 as the stabilizer of a pair of complementary dodecads of 24 points, with outer automorphisms of M12 swapping the two dodecads.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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