Finite dimensional approximations of certain amalgamated free products of groups
Christopher P. Schafhauser · arXiv (Cornell University) · 2023
A group is called matricial field (MF) if it admits finite dimensional approximate unitary representations which are approximately faithful and approximately contained in the left regular representation. This paper provides a new class of MF groups by showing that given two amenable groups with a common normal subgroup, the amalgamated free product is MF.