Algebra & Number Theory
- Algebra Number Theory
- Volume 9, Number 3 (2015), 601-628.
Complex group algebras of the double covers of the symmetric and alternating groups
We prove that the double covers of the alternating and symmetric groups are determined by their complex group algebras. To be more precise, let be an integer, a finite group, and let and denote the double covers of and , respectively. We prove that if and only if , and if and only if or . This in particular completes the proof of a conjecture proposed by the second and fourth authors that every finite quasisimple group is determined uniquely up to isomorphism by the structure of its complex group algebra. The known results on prime power degrees and relatively small degrees of irreducible (linear and projective) representations of the symmetric and alternating groups together with the classification of finite simple groups play an essential role in the proofs.
Algebra Number Theory, Volume 9, Number 3 (2015), 601-628.
Received: 19 May 2014
Revised: 13 January 2015
Accepted: 23 February 2015
First available in Project Euclid: 16 November 2017
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Bessenrodt, Christine; Nguyen, Hung; Olsson, Jørn; Tong-Viet, Hung. Complex group algebras of the double covers of the symmetric and alternating groups. Algebra Number Theory 9 (2015), no. 3, 601--628. doi:10.2140/ant.2015.9.601. https://projecteuclid.org/euclid.ant/1510842313