English

Almost recognizability by spectrum of simple exceptional groups of Lie type

Group Theory 2021-01-01 v2

Abstract

The spectrum of a finite group is the set of its elements orders. Groups are said to be isospectral if their spectra coincide. For every finite simple exceptional group L=E7(q)L=E_7(q), we prove that each finite group isospectral to LL is isomorphic to a group GG squeezed between LL and its automorphism group, that is LGAutLL\leq G\leq \operatorname{Aut}L; in particular, up-to isomorphism, there are only finitely many such groups. This assertion, together with a series of previously obtained results, implies that the same is true for every finite simple exceptional group except the group 3D4(2){}^3D_4(2).

Keywords

Cite

@article{arxiv.1409.2967,
  title  = {Almost recognizability by spectrum of simple exceptional groups of Lie type},
  author = {Andrey V. Vasil'ev and Alexey M. Staroletov},
  journal= {arXiv preprint arXiv:1409.2967},
  year   = {2021}
}

Comments

minor changes, Tables 2 and 3 are fixed