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Abelian subgroup of maximum rank

Definition

Suppose P is a group of prime power order. A subgroup A of P is termed an abelian subgroup of maximum rank if A is an abelian subgroup of P and the rank of A (i.e., the minimum number of elements needed to generate A) is the maximum among the ranks of all abelian subgroups of P.

Note that abelian subgroups of maximum rank need not be maximal among abelian subgroups.

The join of all such subgroups is termed the join of abelian subgroups of maximum rank, and is one of the three Thompson subgroups often considered for groups of prime power order.

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