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Abstract commensurators of solvable Baumslag - Solitar groups
Abstract commensurators solvable Baumslag - Solitar groups
2011/2/22
We prove that for any n > 2, the abstract commensurator group of the Baumslag –Solitar group BS(1, n) is isomorphic to the subgroup { 1 q 0 p | q ∈ Q, p ∈ Q∗} of GL2(Q).