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Spin representations of twisted central products of double covering finite groups and the case of permutation groups

机译:双重覆盖有限群的扭曲中心积的自旋表示和置换群的情况

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Let 5 be a finite group with a character, sgn, of order 2, and S' its central extension by a group Z = (z) of order 2. A representation π of S' is called spin if π(zσ') = -π(σ') (σ' ∈ S'), and the set of all equivalence classes of spin irreducible representations (= IRs) of S' is called the spin dual of S'. Take a finite number of such triplets (S'_j, z_j, sgn_j,) (1 ≤ j ≤ m). We define twisted central product S' = S'_1 * S'_2 *... * S'_m as a double covering of S = S_1 × ... × S_m, S_j = S'_j/(z_j), and for spin IRs π_j, of S'_j, define twisted central product π = π-1 *π_2* ... *π_m as a spin IR of S'. We study their characters and prove that the set of spin IRs π of this type gives a complete set of representatives of the spin dual of S'. These results are applied to the case of representation groups S' for S = (O)_n and (A)_n, and their (Probenius-)Young type subgroups.
机译:令5是一个具有sgn阶数为2的有限群,其S'的中心扩展为Z =(z)阶数为2的群。如果π(zσ')= -π(σ')(σ'∈S'),并且S'的自旋不可约表示(= IR)的所有等价类的集合称为S'的自旋对偶。取有限数量的此类三元组(S'_j,z_j,sgn_j)(1≤j≤m)。我们将扭曲的中央乘积S'= S'_1 * S'_2 * ... * S'_m定义为S = S_1×...×S_m,S_j = S'_j /(z_j)的双覆盖S'_j的自旋IRπ_j将扭曲的中心乘积π=π-1*π_2* ... *π_m定义为S'的自旋IR。我们研究了它们的特性,证明了这种自旋IRπ的集合给出了S'自旋对偶的完整代表。这些结果适用于S =(O)_n和(A)_n的表示组S'及其(Probenius-)Young型子组的情况。

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