
doi: 10.1007/bf01237856
Let \(G_ 2(q)\) be the (simple) group of Lie type \((G_ 2)\) over the finite field GF(q). The following result is proved. Theorem. Let \(G=G_ 2(q)\) and \(G=AB\) where A, B are proper non-Abelian simple subgroups of G. Then one of the following holds: (1) \(q=4\) and \(A\cong HJ\), \(B\cong U_ 3(4)\); (2) \(q=3^ n\) and \(A\cong L_ 3(q)\), \(B\cong U_ 3(q)\); (3) \(q=3^{2n+1}>3\) and \(A\cong L_ 3(q)\), \(B\cong^ 2G_ 2(q)\). The factorizations (1)-(3) exist. In the above, HJ is the Hall-Janko simple group, \(L_ 3(q)\) and \(U_ 3(q)\) denote respectively \(PSL_ 3(q)\) and \(PSU_ 3(q^ 2)\), and \({}^ 2G_ 2(q)\) is the Ree group of characteristic 3. This result has been proved independently U. Preiser.
simple subgroups, Products of subgroups of abstract finite groups, group of Lie type, Finite simple groups and their classification, Hall-Janko simple group, factorizations
simple subgroups, Products of subgroups of abstract finite groups, group of Lie type, Finite simple groups and their classification, Hall-Janko simple group, factorizations
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