Fischer group Fi22 In the area of modern algebra known as group theory , the Fischer group Fi22 is a sporadic simple group of order History Fi22 is one of the 26 sporadic groups and is the smallest of the three Fischer groups . It was introduced by while investigating 3-transposition groups. The outer automorphism group has order 2, and the Schur multiplier has order 6.Representations The Fischer group Fi22 has a rank 3 action on a graph of 3510 vertices corresponding to its 3-transpositions, with point stabilizer the double cover of the group PSU6 . It also has two rank 3 actions on 14080 points, exchanged by an outer automorphism . Fi22 has an irreducible real representation of dimension 78. Reducing an integral form of this mod 3 gives a representation of Fi22 over the field with 3 elements, whose quotient by the 1-dimensional space of fixed vectors is a 77-dimensional irreducible representation . The perfect triple cover of Fi22 has an irreducible representation of dimension 27 over the field with 4 elements. This arises from the fact that Fi22 is a subgroup of ²E₆. All the ordinary and modular character tables of Fi22 have been computed. found the 5-modular character table , and found the 2- and 3-modular character tables . The automorphism group of Fi22 centralizes an element of order 3 in the baby monster .Conway and Norton suggested in their 1979 paper that monstrous moonshine is not limited to the monster , but that similar phenomena may be found for other groups. Larissa Queen and others subsequently found that one can construct the expansions of many Hauptmoduln from simple combinations of dimensions of sporadic groups. For Fi 22 , the McKay-Thompson series is where one can set a = 10, and η is the Dedekind eta function .Maximal subgroups found the 12 conjugacy classes of maximal subgroups of Fi22 as follows: 2·U6 O7 O:S3 210 :M22 26 :S6 : U4 :2 × S3 2 F4 ' 25+8 : 31+6 :23+4 :32 :2 S10 M12
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