Addendum to : “Prime graph components of finite almost simple groups” [Rend. Sem. Mat. Univ. Padova 102 (1999), 1–22]
Prime graph components of finite almost simple groups
Groups in which the prime graph is a tree
The prime graph of a finite group is defined as follows: the set of vertices is , the set of primes dividing the order of , and two vertices , are joined by an edge (we write ) if and only if there exists an element in of order . We study the groups such that the prime graph is a tree, proving that, in this case, .
Recognition of some linear groups over the binary field by the spectrum.
-groups.
On recognition of the projective special linear groups over binary fields.
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