A. Margolis

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20192022

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math.GR2022

Counting lattices in products of trees

Nir Lazarovich, Ivan Levcovitz, Alex Margolis

A BMW group of degree $(m, n)$ is a group that acts simply transitively on vertices of the product of two regular trees of degrees $m$ and $n$ . We show that the number of commensura…

math.GR2019

Groups of cohomological codimension one

Alexander Margolis

We show that if $H$ is an almost normal subgroup of $G$ such that both $H$ and $G$ are of type $V F P$ and vcd( $G$ ) = vcd( $H$ ) + 1, then $G$ is the fundamental group of a graph of gr…