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Generation of finite groups by nilpotent subgroups

E. Damian (2003)

Bollettino dell'Unione Matematica Italiana

We study the generation of finite groups by nilpotent subgroups and in particular we investigate the structure of groups which cannot be generated by n nilpotent subgroups and such that every proper quotient can be generated by n nilpotent subgroups. We obtain some results about the structure of these groups and a lower bound for their orders.

Groups in which the prime graph is a tree

Maria Silvia Lucido (2002)

Bollettino dell'Unione Matematica Italiana

The prime graph Γ G of a finite group G is defined as follows: the set of vertices is π G , the set of primes dividing the order of G , and two vertices p , q are joined by an edge (we write p q ) if and only if there exists an element in G of order p q . We study the groups G such that the prime graph Γ G is a tree, proving that, in this case, π G 8 .

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